Strategic Application of Named Reaction Organic Symthesis

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Strategic Applications
of Named Reactions in
Organic Synthesis

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Strategic Applications
of Named Reactions in
Organic Synthesis
Background and
Detailed Mechanisms
by

László Kürti and Barbara Czakó
UNIVERSITY OF PENNSYLVANIA

250 Named Reactions

AMSTERDAM • BOSTON • HEIDELBERG • LONDON • NEW YORK • OXFORD • PARIS
SAN DIEGO • SAN FRANCISCO • SINGAPORE • SYDNEY • TOKYO
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Senior Publishing Editor Jeremy Hayhurst
Project Manager Carl M. Soares
Editorial Assistant Desiree Marr
Marketing Manager Linda Beattie
Cover Printer RR Donnelley
Interior Printer RR Donnelley
Elsevier Academic Press
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This book is dedicated to

Professor Madeleine M. Joullié
for her lifelong commitment
to mentoring graduate students

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ABOUT THE AUTHORS

Barbara Czakó was born and raised in Hungary. She
received her Diploma from Lajos Kossuth University in
Debrecen, Hungary (now University of Debrecen). She
obtained her Master of Science degree at University of
Missouri-Columbia. Currently she is pursuing her Ph.D.
degree

in

synthetic

organic

chemistry

under

the

supervision of Professor Gary A. Molander at the
University of Pennsylvania.

László Kürti was born and raised in Hungary. He
received his Diploma from Lajos Kossuth University in
Debrecen, Hungary (now University of Debrecen). He
obtained his Master of Science degree at University of
Missouri-Columbia. Currently he is pursuing his Ph.D.
degree

in

synthetic

organic

chemistry

under

the

supervision of Professor Amos B. Smith III at the
University of Pennsylvania.

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ACKNOWLEDGEMENTS
The road that led to the completion of this book was difficult, however, we enjoyed the support of
many wonderful people who guided and helped us along the way. The most influential person was
Professor Madeleine M. Joullié whose insight, honest criticism and invaluable suggestions helped to
mold the manuscript into its current form.
When we completed half of the manuscript in early 2004, Professor Amos B. Smith III was
teaching his synthesis class "Strategies and Tactics in Organic Synthesis" and adopted the manuscript.
We would like to thank him for his support and encouragement. We also thank the students in his class
for their useful observations that aided the design of a number of difficult schemes.
Our thanks also go to Professor Gary A. Molander for his valuable remarks regarding the
organometallic reactions. He had several excellent suggestions on which named reactions to include.
Earlier this year our publisher, Academic Press/Elsevier Science, sent the manuscript to a
number of research groups in the US as well as in the UK. The thorough review conducted by the

professors and in some cases also by volunteer graduate students is greatly appreciated.
They are (in alphabetical order):
Professor Donald H. Aue (University of California
Santa Barbara)
Professor Ian Fleming (University of Cambridge,
UK)
Professor Rainer Glaser (University of MissouriColumbia)
Professor Michael Harmata (University of MissouriColumbia)

Professor Robert A. W. Johnstone (University of
Liverpool, UK)
Professor Erik J. Sorensen (Princeton University)
Professor P. A. Wender (Stanford University) and
two of his graduate students Cindy Kan and John
Kowalski
Professor Peter Wipf (University of Pittsburgh)

We would like to express our gratitude to the following friends/colleagues who have carefully read
multiple versions of the manuscript and we thank them for the excellent remarks and helpful discussions.
They were instrumental in making the manuscript as accurate and error free as possible:
James P. Carey (Merck Research Laboratories)
Akin H. Davulcu (Bristol-Myers Squibb/University of
Pennsylvania)
Dr. Mehmet Kahraman (Kalypsys, Inc.)

Justin Ragains (University of Pennsylvania)
Thomas Razler (University of Pennsylvania)

There were several other friends/colleagues who reviewed certain parts of the manuscript or
earlier versions and gave us valuable feedback on the content as well as in the design of the schemes.

Clay Bennett (University of Pennsylvania)
Prof. Cheon-Gyu Cho (Hanyang University,
Korea/University of Pennsylvania)
Dr. Shane Foister (University of Pennsylvania)
Dr. Eugen Mesaros (University of Pennsylvania)

Dr. Emmanuel Meyer (University of Pennsylvania)
David J. St. Jean, Jr. (University of Pennsylvania)
Dr. Kirsten Zeitler (University of Regensburg,
Germany)

Finally, we would like to thank our editor at Elsevier, Jeremy Hayhurst, who gave us the chance
to make a contribution to the education of graduate students in the field of organic chemistry. He
generously approved all of our requests for technical support thus helping us tremendously to finish the
writing in a record amount of time. Our special thanks are extended to editorial assistants Desireé Marr
and previously, Nora Donaghy, who helped conduct the reviews and made sure that we did not get lost
in a maze of documents.

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CONTENTS

I.

Foreword by E.J. Corey.................................................................................................... x

II.

Introduction by K.C. Nicolaou ......................................................................................... xi

III.

Preface ............................................................................................................................xii

IV.

Explanation of the Use of Colors in the Schemes and Text ..........................................xiv

V.

List of Abbreviations ..................................................................................................xvii

VI.

List of Named Organic Reactions................................................................................xlv

VII.

Named Organic Reactions in Alphabetical Order ........................................................ 1

VIII.

Appendix: Listing of the Named Reactions by Synthetic Type and by their Utility...... 502
8.1 Brief explanation of the organization of this section.............................................. 502
8.2 List of named reactions in chronological order of their discovery.......................... 503
8.3 Reaction categories – Categorization of named reactions in tabular format......... 508
8.4 Affected functional groups – Listing of transformations in tabular format.............. 518
8.5 Preparation of functional groups – Listing of transformations in tabular format .... 526

IX.

References................................................................................................................... 531

X.

Index............................................................................................................................. 715

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FOREWORD
This book on "Strategic Applications of Named Reactions in Organic Synthesis"
is destined to become unusually useful, valuable, and influential for advanced students
and researchers in the field. It breaks new ground in many ways and sets an admirable
standard for the next generation of texts and reference works. Its virtues are so

numerous there is a problem in deciding where to begin. My first impression upon
opening the book was that the appearance of its pages is uniformly elegant and pleasing
– from the formula graphics, to the print, to the layout, and to the logical organization and
format. The authors employ four-color graphics in a thoughtful and effective way. All the
chemical formulas are exquisitely drawn.
The book covers many varied and useful reactions for the synthesis of complex
molecules, and in a remarkably clear, authoritative and balanced way, considering that
only two pages are allocated for each. This is done with unusual rigor and attention to
detail. Packed within each two-page section are historical background, a concise
exposition of reaction mechanism and salient and/or recent applications. The context of
each example is made crystal clear by the inclusion of the structure of the final synthetic
target. The referencing is eclectic but extensive and up to date; important reviews are
included.
The amount of information that is important for chemists working at the frontiers
of synthesis to know is truly enormous, and also constantly growing. For a young chemist
in this field, there is so much to learn that the subject is at the very least daunting. It
would be well neigh impossible were it not for the efforts of countless authors of
textbooks and reviews. This book represents a very efficient and attractive way forward
and a model for future authors. If I were a student of synthetic chemistry, I would read
this volume section by section and keep it close at hand for reference and further study.
I extend congratulations to László Kürti and Barbara Czakó for a truly fine
accomplishment and a massive amount of work that made it possible. The scholarship
and care that they brought to this task will be widely appreciated because they leap out of
each page. I hope that this wonderful team will consider extending their joint venture to
other regions of synthetic chemical space. Job well done!

E. J. Corey
January, 2005

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INTRODUCTION
The field of chemical synthesis continues to amaze with its growing and
impressive power to construct increasingly complex and diverse molecular architectures.
Being the precise science that it is, this discipline often extends not only into the realms
of technology, but also into the domains of the fine arts, for it engenders unparallel
potential for creativity and imagination in its practice. Enterprises in chemical synthesis
encompass both the discovery and development of powerful reactions and the invention
of synthetic strategies for the construction of defined target molecules, natural or
designed, more or less complex. While studies in the former area –synthetic
methodology– fuel and enable studies in the latter –target synthesis– the latter field offers
a testing ground for the former. Blending the two areas provides for an exciting endeavor
to contemplate, experience, and watch. The enduring art of total synthesis, in particular,
affords the most stringent test of chemical reactions, old and new, named and unnamed,
while its overall reach and efficiency provides a measure of its condition at any given
time. The interplay of total synthesis and its tools, the chemical reactions, is a fascinating
subject whether it is written, read, or practiced.
This superb volume by László Kürti and Barbara Czakó demonstrates clearly the
power and beauty of this blend of science and art. The authors have developed a
standard two-page format for discussing each of their 250 selections whereby each
named reaction is concisely introduced, mechanistically explained, and appropriately
exemplified with highlights of constructions of natural products, key intermediates and
other important molecules. These literature highlights are a real treasure trove of

information and a joy to read, bringing each named reaction to life and conveying a
strong sense of its utility and dynamism. The inclusion of an up-to-date reference listing
offers a complete overview of each reaction at one’s fingertips.
The vast wealth of information so effectively compiled in this colorful text will not
only prove to be extraordinarily useful to students and practitioners of the art of chemical
synthesis, but will also help facilitate the shaping of its future as it moves forward into
ever higher levels of complexity, diversity and efficiency. The vitality of the enduring field
of total synthesis exudes from this book, captivating the attention of the reader
throughout. The authors are to be congratulated for the rich and lively style they
developed and which they so effectively employed in their didactic and aesthetically
pleasing presentations. The essence of the art and science of synthesis comes alive from
the pages of this wonderful text, which should earn its rightful place in the synthetic
chemist’s library and serve as an inspiration to today’s students to discover, invent and
apply their own future named reactions. Our thanks are certainly due to László Kürti and
Barbara Czakó for a splendid contribution to our science.

K.C. Nicolaou
January, 2005

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PREFACE
Today’s organic chemist is faced with the challenge of navigating his or her way

through the vast body of literature generated daily. Papers and review articles are full of
scientific jargon involving the description of methods, reactions and processes defined by
the names of the inventors or by a well-accepted phrase. The use of so-called “named
reactions” plays an important role in organic chemistry. Recognizing these named
reactions and understanding their scientific content is essential for graduate students and
practicing organic chemists.
This book includes some of the most frequently used named reactions in organic
synthesis. The reactions were chosen on the basis of importance and utility in synthetic
organic chemistry. Our goal is to provide the reader with an introduction that includes a
detailed mechanism to a given reaction, and to present its use in recent synthetic
examples. This manuscript is not a textbook in the classical sense: it does not include
exercises or chapter summaries. However, by describing 250 named organic reactions
and methods with an extensive list of leading references, the book is well-suited for
independent or classroom study. On one hand, the compiled information for these
indispensable reactions can be used for finding important articles or reviews on a given
subject. On the other hand, it can also serve as supplementary material for the study of
organic reaction mechanisms and synthesis.
This book places great emphasis on the presentation of the material. Drawings
are presented accurately and with uniformity. Reactions are listed alphabetically and
each named reaction is presented in a convenient two-page layout. On the first page, a
brief introduction summarizes the use and importance of the reaction, including
references to original literature and to all major reviews published after the primary
reference. When applicable, leading references to modifications and theoretical studies
are also given. The introduction is followed by a general scheme of the reaction and by a
detailed mechanism drawn using a four-color code (red, blue, green and black) to ensure
easy understanding. The mechanisms always reflect the latest evidence available for the
given reaction. If the mechanism is unknown or debatable, references to the relevant
studies are included. The second page contains 3 or 4 recent synthetic examples utilizing
the pertinent named reaction. In most cases the examples are taken from a synthetic
sequence leading to the total synthesis of an important molecule or a natural product.

Some examples are taken from articles describing novel methodologies. The synthetic
sequences are drawn using the four-color code, and the procedures are described briefly
in 2-3 sentences. If a particular named reaction involves a complex rearrangement or the
formation of a polycyclic ring system, numbering of the carbon-skeleton is included in
addition to the four-color code. In the depicted examples, the reaction conditions as well
as the ratio of observed isomers (if any) and the reported yields are shown. The target of

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the particular synthetic effort is also illustrated with colors indicating where the
intermediates reside in the final product.
The approach used in this book is also unique in that it emphasizes the clever
use of many reactions that might otherwise have been overlooked.
The almost 10,000 references are indexed at the end of the book and include the
title of the cited book, book section, chapter, journal or review article. The titles of seminal
papers written in a foreign language were translated to English. The name of the author
of a specific synthetic example was chosen as the one having an asterisk in the
reference.
In order to make the book as user-friendly as possible, we have included a
comprehensive list of abbreviations used in the text or drawings along with the structure
of the protecting groups and reagents. Also in an appendix, the named organic reactions
are grouped on the basis of their use in contemporary synthesis. Thus the reader can
readily

ascertain

which

named

organic

reactions

effect

the

same

synthetic

transformations or which functional groups are affected by the use of a particular named
reaction. Finally, an index is provided to allow rapid access to desired information based
on keywords found in the text or the drawings.

László Kürti & Barbara Czakó
University of Pennsylvania
Philadelphia, PA
January 2005

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IV. EXPLANATION OF THE USE OF COLORS
IN THE SCHEMES AND TEXT
The book uses four colors (black, red, blue, and green) to depict the synthetic and mechanistic schemes and highlight
certain parts of the text. In the “Introduction” and “Mechanism” sections of the text, the title named reaction/process
is highlighted in blue and typed in italics:
“The preparation of ketones via the C-alkylation of esters of 3-oxobutanoic acid
(acetoacetic esters) is called the acetoacetic ester synthesis. Acetoacetic esters
can be deprotonated at either the C2 or at both the C2 and C4 carbons,
depending on the amount of base used.”
All other named reactions/processes that are mentioned are typed in italics:
“Dilute acid hydrolyzes the ester group, and the resulting β-keto acid undergoes
decarboxylation to give a ketone (mono- or disubstituted acetone derivative),
while aqueous base induces a retro-Claisen reaction to afford acids after
protonation.”
In the “Synthetic Applications” section, the name of the target molecule is highlighted in blue:
“During the highly stereoselective total synthesis of epothilone B by J.D. White
and co-workers, the stereochemistry of the alcohol portion of the macrolactone
was established by applying Davis’s oxaziridine oxidation of a sodium enolate.”
In the schemes, colors are applied to highlight the changes in a given molecule or intermediate (formation and
breaking of bonds). It is important to note that due to the immense diversity of reactions, it is impossible to implement
a strictly unified use of colors. Therefore, each scheme has a unique use of colors specifically addressing the
given transformation. By utilizing four different colors the authors’ goal is to facilitate understanding. The authors
hope that the readers will look up the cited articles and examine the details of a given synthesis. The following

sample schemes should help the readers to understand how colors are used in this book.
•

In most (but not all) schemes the starting molecule is colored blue, while the reagent or the reaction partner may
be of any of the remaining two colors (red and green). The newly formed bonds are always black.
new bond
BnO

BnO
O

Zn-Cu,
Et2O, 0 °C

BnO

Cl

O

Cl3CCOCl

Cl

BnO

O

OBn

OBn
new bond

•

The general schemes follow the same principle of coloring, and where applicable the same type of key reagents
are depicted using the same color. (In this example the two different metal-derived reagents are colored green.)
Simmons & Smith (1958):
R2

R2

CH2

Zn-Cu

R1
(Z)-1,2-disubstituted alkene

CH2I2 / ether

R1

R

R

1

R4

R3
substituted
alkene

non-coordinating
solvent

CH2I2 / ether

CH2
R1
1,2-trans-Disubstituted cyclopropane

Charette asymmetric modification (1994):
R5

H
Et2Zn / R5CHI2

Zn-Cu

R1
(E)-1,2-disubstituted
alkene

1,2-cis-Disubstituted
cyclopropane

Furukawa modification (1966):
2

R2

R2

R2

C

R6

HO
R1

R1

R4
R3
Substituted
cyclopropane

R2

+
R3

O

R6

B

Et2Zn
R5CHI2

O

DME/DCM

Bu
allylic alcohol dioxaborolane

R5

H
R1

C

OH

R2
R3
Optically active
cyclopropane

R1-4 = H, substituted alkyl and aryl; R5 = H, Me, phenyl; R6 = CONMe2; non-coordinating solvent: toluene, benzene, DCM, DCE

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The mechanistic schemes benefit the most from the use of four colors. These schemes also include extensive
arrow-pushing. The following two schemes demonstrate this point very well.
•

The catalytic cycle for the Suzuki cross-coupling:
LnPd(0)
R1 R 2

R2 X

reductive
elimination

oxidative
addition

R1 B(R)2

L

L(n-1)Pd(II)

M+(-OR)
base

+

organoborane

R1

X
LnPd(II)

R2

R2

OR
1

R

B(R)2

M+(-OR)

borate

transmetallation

metathesis

L + RO B(R)2
OR
LnPd(II)

•

M+(-X)

OR
R2

The mechanism of the Swern oxidation:

Activation of DMSO with TFAA:
O
F 3C

O
O

O
CF3

F3C

CH3

H 3C S

O S

CF3

O

O

< -30 °C

O

S CH3

O

CH3

R

F 3C

2

HO

CH3

O

O

R1

S

CH3

- CF3COOH

R1

O

H

H 3C

Activation of DMSO with oxalyl chloride:
O

H 3C

H 3C S

H 3C
Activation of the alcohol:
CH3
Cl S
HO

CH3
chlorosulfonium
salt

F 3C

S

CH2
O

O
side product

H

NEt3

H 3C

R1

S

CH2
R1

O

R2

alkoxysulfonium
ylide

R2
alkoxysulfonium
salt

O

CH3

- Cl

O

H 3C

S

O

CH3

Cl

R1

S

H

S

CH2

O
R

CH3

R

H 3C

- HCl

R1

O

S

S

H2
C

NEt3

H

R2

1

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S

C
H2

H

O
+

C +

R2
R1
Ketone or Aldehyde

CO

O

H3C

S
O

R1

O

H 3C

+

CH3
chlorosulfonium
salt

R2

H
2

Cl

O

R2

O

CH3

Cl

O

CH3

H 3C
Formation of the product:

Cl

Cl

S O

Pummerer
rearrangement

S

O

Cl
O

H2
C

O

R2

Cl

H 3C

trifluoroacetoxydimethylsulfonium trifluoroacetate

Activation of the alcohol:
F 3C

> -30 °C

CF3

O

CH3

CH3

CH3

CF3CO2
H 3C S O

O

CH2
R1

R2
alkoxysulfonium
ylide


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In the case of complex rearrangements, numbering of the initial carbon skeleton has been applied in addition to
the colors to facilitate understanding. Again, the newly formed bonds are black.

OH
5

4

OK
KH, 18-crown-6

3

6

HN 2

6

THF, r.t.

1

4

5

N2

N2

2-aza-Cope

1

OK
5

6

4

3

H

1

CN

•

[3,3]

3

In most instances, the product of a given named reaction/process will be part of a larger structure (e.g., natural
product) at the end of the described synthetic effort. For pedagogical reasons, the authors decided to indicate
where the building block appears in the target structure. It is the authors’ hope that the reader will be able to put
the named reaction/process in context and the provided synthetic example will not be just an abstract one.

OTHP

OTHP
1. NaHMDS, THF,
-78 °C

N

Bn

O
O

•

PhO2S

steps
OH

O

2.

O

N

Ph

3. CSA, THF, -78 °C
71% for 3 steps

O
N

O

S

Bn

O
O

OH

N
O
O
OH
Epothilone B

O

The references at the end of the book are listed in alphabetical order, and the named reaction for which the
references are listed is typed in blue and with boldface (see Dakin oxidation). Important: the references are
listed in chronological order when they appear as superscript numbers in the text (e.g., reference 10 is a
more recent paper than reference 12, but it received a smaller reference number because it was cited in the text
earlier).
Mechanism: 12,10,15-17
The mechanism of the Dakin oxidation is very similar to the mechanism of the Baeyer-Villiger oxidation.

•

For the Dakin oxidation example, the references at the end of the book will be printed in the order they have
been cited, but within a group of references (e.g., 15-17) they appear in chronological order.
Dakin oxidation
10. Hocking, M. B. Dakin oxidation of o-hydroxyacetophenone and some benzophenones. Rate enhancement and mechanistic aspects.
Can. J. Chem. 1973, 51, 2384-2392.
11. Matsumoto, M., Kobayashi, K., Hotta, Y. Acid-catalyzed oxidation of benzaldehydes to phenols by hydrogen peroxide. J. Org. Chem.
1984, 49, 4740-4741.
12. Ogata, Y., Sawaki, Y. Kinetics of the Baeyer-Villiger reaction of benzaldehydes with perbenzoic acid in aquo-organic solvents. J. Org.
Chem. 1969, 34, 3985-3991.
13. Boeseken, J., Coden, W. D., Kip, C. J. The synthesis of sesamol and of its β-glucoside. The Baudouin reaction. Rec. trav. chim. 1936,
55, 815-820.
14. Kabalka, G. W., Reddy, N. K., Narayana, C. Sodium percarbonate: a convenient reagent for the Dakin reaction. Tetrahedron Lett. 1992,

33, 865-866.
15. Hocking, M. B., Ong, J. H. Kinetic studies of Dakin oxidation of o- and p-hydroxyacetophenones. Can. J. Chem. 1977, 55, 102-110.
16. Hocking, M. B., Ko, M., Smyth, T. A. Detection of intermediates and isolation of hydroquinone monoacetate in the Dakin oxidation of phydroxyacetophenone. Can. J. Chem. 1978, 56, 2646-2649.
17. Hocking, M. B., Bhandari, K., Shell, B., Smyth, T. A. Steric and pH effects on the rate of Dakin oxidation of acylphenols. J. Org. Chem.
1982, 47, 4208-4215.

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V. LIST OF ABBREVIATIONS
Abbreviation

Chemical Name

Chemical Structure
O
O

O

18-Cr-6

18-crown-6
O

O
O

O

Ac

acetyl

acac

acetylacetonyl

AA
AD

asymmetric aminohydroxylation
asymmetric dihydroxylation

ad

adamantyl

O

O

NA
NA

O
N

ADDP

N N

1,1'-(azodicarbonyl)dipiperidine
N

O

ADMET

NA

acyclic diene metathesis polymerization

O

acaen

N

N,N’-bis(1-methyl-3-oxobutylidene)ethylenediamine

N

O

AIBN

2,2'-azo bisisobutyronitrile

Alloc

allyloxycarbonyl
O

Am

amyl (n-pentyl)

An

p-anisyl

ANRORC
aq

anionic ring-opening ring-closing
aqueous

O

NA
NA

O

AQN

anthraquinone
O

Ar

aryl (substituted aromatic ring)

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N

N N

N

NA

O


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Abbreviation

Chemical Name

Chemical Structure

ATD

aluminum tris(2,6-di-tert-butyl-4-methylphenoxide)

atm

5
1 atmosphere = 10 Pa (pressure)

O

Al

3

NA
Ph

ATPH

aluminum tris(2,6-diphenylphenoxide)

O

Al

Ph

BBN (9-BBN)

9-borabicyclo[3.3.1]nonane (9-BBN)

B

H

B

BCME

9-borabicyclo[3.3.1]nonyl

bis(chloromethyl)ether

3

B

Cl

O

Cl

O

BCN

BDPP

N-benzyloxycarbonyloxy-5-norbornene-2,3dicarboximide

(2R, 4R) or (2S, 4S) bis(diphenylphosphino)pentane

N O
O
O

O

Ph2P

PPh2
(R)

(R)

BER

NA

borohydride exchange resin

OH

BHT

2,6-di-t-butyl-p-cresol (butylated hydroxytoluene)

BICP

2(R)-2’(R)-bis(dipenylphosphino)-1(R),1’(R)dicyclopentane

BINAL-H

BINAP

2,2'-dihydroxy-1,1'-binaphthyl lithium aluminum
hydride

2,2'-bis(diphenylphosphino)-1,1'-binaphthyl

(R) (R)
(R)

(R)

Ph2P

PPh2

O
O

H

Al

Li
H

PPh2
PPh2

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Abbreviation

Chemical Name

BINOL

1,1'-bi-2,2'-naphthol

Chemical Structure

OH

OH

O
S

Bip

biphenyl-4-sulfonyl

bipy

2,2'-bipyridyl

BLA

Brönsted acid assisted chiral Lewis acid

bmin

1-butyl-3-methylimidazolium cation

BMS

Borane-dimethyl sulfide complex

Bn

benzyl

O

N

N

NA

N

N

H3B SMe2

O

BNAH

1-benzyl-1,4-dihydronicotinamide

BOB

4-benzyloxybutyryl

Boc

t-butoxycarbonyl

N

NH2

O

O

O

O

O

BOM

benzyloxymethyl

BOP-Cl

bis(2-oxo-3-oxazolidinyl)phosphinic chloride

O

O

Cl

O

P
N

N

O

O

NA

bp

boiling point

BPD

bis(pinacolato)diboron

O
O

B B

O
O
O

O

O

BPO

benzoyl peroxide

BPS (TBDPS)

t-butyldiphenylsilyl

O

Ph

Si

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Ph


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Abbreviation

Chemical Name

BQ

benzoquinone

Chemical Structure
O

O

O

Bs

brosyl =
(4-bromobenzenesulfonyl)

BSA

N,O-bis(trimethylsilyl)acetamide

BSA

Bovine serum albumin

Bt

1- or 2-benzotriazolyl

S

Br

O

O
Si

Si N

NA

N
N
N

F

BTAF

benzyltrimethylammonium fluoride

BTEA

benzyltriethylammonium

BTEAC

benzyltriethylammonium chloride

BTFP

3-bromo-1,1,1-trifluoro-propan-2-one

N

N

Cl
N

F

O

F
F
Br

BTMA

benzyltrimethylammonium

N

BTMSA

bis(trimethylsilyl) acetylene

Si

Si

O

BTS

bis(trimethylsilyl) sulfate

Si

O

benzothiazole 2-sulfonic acid

BTSP

bis(trimethylsilyl) peroxide

Bz

benzoyl

Bu ( Bu)

n

n-butyl

c

cyclo

S

HO S
N

O

Si

O

O

O

NA

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Si

O

O

BTSA

O

S

Si


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Abbreviation

Chemical Name

Chemical Structure

ca

NA

CA

circa
(approximately)
chloroacetyl

CAN

cerium(IV) ammonium nitrate (cericammonium
nitrate)

Ce(NH4)2(NO3)6

cat.

catalytic

NA

CB

catecholborane

O

Cl

O
HB
O
H Ph

CBS

Corey-Bakshi-Shibata reagent
N B

Ph
R = H, alkyl

O

R

Cbz (Z)

O

benzyloxycarbonyl

O

cc. or conc.
CCE

NA

concentrated
constant current electrolysis

NA
O

CDI

carbonyl diimidazole

CHD

1,3 or 1,4-cyclohexadiene

N

N

N

1,3-CHD

N

1,4-CHD

Ph

CHIRAPHOS

2,3-bis(diphenylphosphino)butane

Ph

(S)

P

(S)

P
Ph

Ph

Chx (Cy)

cyclohexyl

Cl

CIP

2-chloro-1,3-dimethylimidazolidinium
hexafluorophosphate

CM (XMET)

cross metathesis

CMMP

cyanomethylenetrimethyl phosphorane

COD

1,5-cyclooctadiene

COT

1,3,5-cyclooctatriene

Cp

cyclopentadienyl

N

NH

PF6

NA

P

N

O
S O

CPTS

collidinium-p-toluenesulfonate

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O

H N

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Abbreviation

Chemical Name

Chemical Structure

CRA

complex reducing agent

NA

Cr-PILC

chromium-pillared clay catalyst

NA

CSA

camphorsufonic acid
O

CSI

SO3H

O

chlorosulfonyl isocyanate

CTAB

cetyl trimethylammonium bromide

CTACl

cetyl trimethylammonium chloride

N

S

Cl

C

O

O

N

N

Cl

C15H31

CTAP

N

cetyl trimethylammonium permanganate

MnO4

C15H31

Δ
d

heat
days (length of reaction time)

DABCO

1,4-diazabicyclo[2.2.2]octane

NA
NA
N
N
N

N

F

DAST

diethylaminosulfur trifluoride

F S N
F

DATMP

diethylaluminum 2,2,6,6-tetramethylpiperidide

N
AlEt2

Ph

DBA (dba)

dibenzylideneacetone

Ph
O

O

DBAD

N

di-tert-butylazodicarboxylate
O

O
N
O

O

Br
N

DBI

dibromoisocyanuric acid

O

NH
N
Br

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O

Br


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Abbreviation

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Chemical Name

Chemical Structure
O

DBM

O

dibenzoylmethane

9

DBN

1

1,5-diazabicyclo[4.3.0]non-5-ene

6

N

4

5

dibenzosuberyl

11

DBU

3

8
7

DBS

2

N

1,8-diazabicyclo[5.4.0]undec-7-ene

1

2

3

N

10
9

N

4

7

5
6

8

CN

DCA

9,10-dicyanoanthracene
CN
Cl

DCB

1,2-dichlorobenzene

DCC

dicyclohexylcarbodiimide

DCE

1,1-dichloroethane

Cl

N

C

N

Cl
Cl

DCM

CH2Cl2

dichloromethane

CN

DCN

1,4-dicyanonaphthalene
CN

Dcpm

dicyclopropylmethyl

DCU

N,N’-dicyclohexylurea

O
N
H

N
H
O

NC

DDQ

Cl

2,3-dichloro-5,6-dicyano-1,4-benzoquinone
NC

Cl
O

de

diastereomeric excess

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NA


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Abbreviation

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Chemical Name

Chemical Structure
O

DEAD

diethyl azodicarboxylate

O

N

N

O
O

DEIPS

diethylisopropylsilyl

DEPBT

3-(diethoxyphosphoryloxy)-1,2,3-benzotriazin4(3H)-one

Si

N

O

O

DET

O

OEt
O
N
P

EtO

OH
O

(R)

diethyl tartrate

N

(R)

O
HO

DHP

O

3,4-dihydro-2H-pyran
O

OMe

DHQ

H

dihydroquinine

OH
N

N

H

Et

Et
N

(DHQ)2PHAL

H

bis(dihydroquinino)phthalazine

H

N

N N
O

O

H
H
OMe

MeO
N

N

OMe

DHQD

dihydroquinidine

H

N
OH
H

N

Et

Et
N
H

(DHQD)2PHAL

bis(dihydroquinidino)phthalazine

H

N
N N

O

O

H
OMe
N

N

O

DIAD

diisopropyl azodicarboxylate

N
O

O
N
O
O

DIB

(BAIB or PIDA)

(diacetoxyiodo)benzene

O
O

I
O

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H

MeO


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Abbreviation

Chemical Name

DIBAL (DIBAH)
DIBAL-H

diisobutylaluminum hydride

DIC

diisopropyl carbodiimide

diop

Chemical Structure
H
Al

N

4,5-bis-[(diphenylphosphanyl)methyl]-2,2-dimethyl[1,3]dioxolane

C

N

O

(R)

PPh2

O

(R)

PPh2

O

DIPAMP

P

1,2-bis(o-anisylphenylphosphino)ethane
P
O

DIPEA
(Hünig's base)

diisopropylethylamine

N

O

DIPT

diisopropyl tartrate

O

OH
(R) (R)

HO

O
O

O

DLP

C10H21

dilauroyl peroxide

O

O

C10H21
O

O

DMA (DMAC)

N,N-dimethylacetamide

DMAD

dimethyl acetylene dicarboxylate

DMAP

N,N-4-dimethylaminopyridine

DMB

m-dimethoxybenzene

N

O

O

O

O

N

N

O

DMDO

dimethyl dioxirane

O

O
O

DME

1,2-dimethoxyethane

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O

O