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Handbook of Reagents for Organic Synthesis Chiral Reagents for Asymmetric Synthesis Edited by Leo A. Paquette The Ohio State University, Columbus, OH, USA Copyright © 2003 John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England Telephone (+44) 1243 779777 E-mail (for orders and customer service enquiries): [email protected] Visit our Home Page on www.wileyeurope.com or www.wiley.com All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except under the terms of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London WlT 4LP, UK, without the permission in writing of the Publisher. Requests to the Publisher should be addressed to the Permissions Department, John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex P019 8SQ, England, or emailed to [email protected], or faxed to (+44) 1243 770620. This publication is designed to provide accurate and authoritative information in regard to the subject matter covered. It is sold on the understanding that the Publisher is not engaged in rendering professional services. If professional advice or other expert assistance is required, the services of a competent professional should be sought. Other Wiley Editorial Offices John Wiley & Sons Inc., 111 River Street, Hoboken, NJ 07030, USA Jossey-Bass, 989 Market Street, San Francisco, CA 94103-1741, USA Wiley-VCH Verlag GmbH, Boschstr. 12, D-69469 Weinheim, Germany John Wiley & Sons Australia Ltd, 33 Park Road, Milton, Queensland 4064, Australia John Wiley & Sons (Asia) Pte Ltd, 2 Clementi Loop #02-01, Jin Xing Distripark, Singapore 129809 John Wiley & Sons Canada Ltd, 22 Worcester Road, Etobicoke, Ontario, Canada M9W ILl Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic books. Library of Congress Cataloguing-in-Publication Data Handbook of reagents for organic synthesis, p. cm. Includes bibliographical references. Contents: [1] Reagents, auxiliaries, and catalysts for C-C bond formation / edited by Robert M. Coates and Scott E. Denmark [2] Oxidising and reducing agents / edited by Steven D. Burke and Riek L. Danheiser [3] Acidic and basic reagents / edited by Hans J. Reich and James H. Rigby [4] Activating agents and protecting groups / edited by Anthony J. Pearson and William R. Roush [5] Chiral Reagents for Asymmetric Synthesis / edited by Leo A. Paquette ISBN 0-471-97924-4 (v. 1). ISBN 0-471-97926-0 (v. 2) ISBN 0-471-97925-2 (v. 3) ISBN 0-471-97927-9 (v. 4) ISBN 0-470-85625-4 (v. 5) 1. Chemical tests and reagents. 2. Organic compounds-Synthesis. QD77.H37 1999 547'.2 dc 21 98-53088 CIP British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library ISBN 0 470 85625 4 Typeset in 9^/1 \\ pt Times Roman by Thomson Press (India) Ltd., New Delhi Printed and bound in Great Britain by Antony Rowe, Chippenham, Wiltshire This book is printed on acid-free paper responsibly manufactured from sustainable forestry in which at least two trees are planted for each one used for paper production. e-EROS Editorial Board Editor-in-Chief Leo A. Paquette The Ohio State University, Columbus, OH, USA Executive Editors David Crich University of Illinois, Chicago, IL, USA Philip L. Fuchs Purdue University, West Lafayette, IN, USA Peter Wipf University of Pittsburgh, Pittsburgh, PA, USA st EROS 1 Print Edition Editorial Board Editor-in-Chief Leo A. Paquette The Ohio State University, Columbus, OH, USA Editors Steven D. Burke Robert M. Coates Rick L. Danheiser University of Wisconsin University of Illinois Massachusetts Institute of at Madison, at Urbana-Champaign, Technology, Cambridge, WI, USA IL, USA MA, USA Scott E. Denmark David J. Hart Lanny S. Liebeskind University of Illinois The Ohio State University, Emory University, Atlanta, at Urbana-Champaign, Columbus, OH, USA GA, USA IL, USA Dennis C. Liotta Anthony J. Pearson Hans J. Reich Emory University, Atlanta, Case Western Reserve University, University of Wisconsin at Madison, CA, USA Cleveland, OH, USA WI, USA James H. Rigby William R. Roush Wayne State University, Detroit, Indiana University, Bloomington, MI, USA IN, USA Assistant Editors James P. Edwards Mark Volmer Ligand Pharmaceuticals, San Diego, Emory University, Atlanta, CA, USA GA, USA International Advisory Board Leon A. Ghosez Jean-Marie Lehn Steven V. Ley Universite Catholique Universite Louis Pasteur, University of Cambridge, de Louvain, Belgium Strasbourg, France UK Chun-Chen Liao • XT ** J r*- - -KK A T . j . „ Lewis N. Mander Giorgio Modena N . . T TT - i ^ . Australian National University, Universitd di Padua, UTTniversity, Hsinchu, Taiwan ^i A i- r i J Canberra, Australia Italy Ryoji Noyori Nagoya University, Japan Gerald Pattenden Edward Piers University of Nottingham, University of British Columbia, Pierre Potier UK Vancouver, Canada CNRS, Gif-sur-Yvette, France W. Nico Speckamp Ekkehard Winterfeldt Hishashi Yamomoto Universiteit van Amsterdam, Universitdt Hannover, Nagoya University, Japan The Netherlands Germany Preface As stated in its Preface, the major motivation for our edited by Robert M. Coates and Scott E. Denmark undertaking publication of the Encyclopedia of Reagents for Oxidizing and Reducing Agents Organic Synthesis was "to incorporate into a single work a edited by Steven D. Burke and Rick L. Danheiser genuinely authoritative and systematic description of the utility of all reagents used in organic chemistry." By all Acidic and Basic Reagents accounts, this reference compendium succeeded admirably edited by Hans J. Reich and James H. Rigby in approaching this objective. Experts from around the Activating Agents and Protecting Groups globe contributed many relevant facts that define the various edited by Anthony J. Pearson and William R. Roush uses characteristic of each reagent. The choice of a masthead format for providing relevant information about each entry, Each of the volumes contains a selected compilation of those the highlighting of key transformations with illustrative entries from the original Encyclopedia that bear on the specific equations, and the incorporation of detailed indexes topic. Ample listings can be found to functionally related serve in tandem to facilitate the retrieval of desired reagents contained in the original work. For the sake of current information. awareness, references to recent reviews and monographs have Notwithstanding these accomplishments, the editors came oeen included, as have relevant new procedures from Organic to recognize that the large size of this eight-volume work and Syntheses. its cost of purchase often deterred the placement of copies of The present volume entitled Chiral Reagents for Asym- the Encyclopedia in or near laboratories where the need for this metric Synthesis constitutes the fifth entry into a continuing type of information is most critical. In an effort to meet this series of utilitarian reference works. As with its predecessors, demand in a cost-effective manner, the decision was made to :his handbook is intended to be an affordable, enlightening cull from the major work that information having the highest :ompilation that will hopefully find its way into the labora- probability for repeated consultation and to incorporate the :ories of all practicing synthetic chemists. Every attempt has same into a set of handbooks. The latter would also be Deen made to be of the broadest possible relevance and the purchasable on a single unit basis. expectation is that my colleagues will share in this opinion. The ultimate result of these deliberations was the publication of the Handbook of Reagents for Organic Leo A. Paquette Synthesis, the first four volumes of which appeared in 1999: Department of Chemistry Reagents, Auxiliaries, and Catalysts for C-C Bond The Ohio State University Formation Columbus, OH, USA Introduction All of us are aware of the sharp increase in demand for subjects related to this general theme. Following that, there is a enantiomerically pure reagents and products that has tran- section that illustrates those procedures appearing in volumes spired over the past twenty-five years or so. To some extent, the 68-78 of Organic Syntheses that feature the detailed pre- move in this direction has been brought on by the quest by paration of enantiomerically enriched end-products. The synthetic organic chemists for optically pure natural product overall intent is to assemble in manageable format as much targets and for effective asymmetric catalysts. More signifi- indispensable information dealing with the subject of Chiral cantly, this activity has been spurred on throughout the world Reagents for Asymmetric Synthesis as possible. To this end, the by governmental oversight agencies whose responsibility it entries are grouped into the following categories: alcohols, is to guarantee the availability of pure drugs for human aldehydes, amides and lactams, amino compounds, carbo- consumption. As a consequence, the international medicinal hydrate derivatives, diols, esters and lactones, heterocycles, chemistry community continues to upgrade its search for ketones, sulfur compounds, phosphines, and miscellaneous. economic ways to develop chiral technology. The need for In the majority of cases, asymmetric reactions are involved. chiral, nonracemic raw materials, intermediates, and bioactive Enantioselective applications of transition metal catalysts can end products continues to grow at a rapid rate. In the light of be found throughout the volume. In the body of the text, no these developments, this seemed an appropriate time for attempt has been made to group the reagents in other than assembly into a single volume of a compilation listing many of alphabetical order. The benefit derived from scanning its pages the optically active reagents and catalysts in use at the present is thereby maximized. time. Finally, we hope that the reader will find this volume to The selection covered in this volume comes from two constitute the useful and convenient handbook it was designed sources. The first is the Encyclopedia of Reagents for Organic to be. This goal will have been reached if the present com- Synthesis (EROS) which was published in 1995. In the pilation develops into a valued adjunct to mainstream synthetic intervening time, new entries have been written by many practice. experts in the field for incorporation into the ever-expanding electronic version of the same work (e-EROS). As to be expected, the compilation includes both well recognized and Leo A. Paquette lesser known reagents and ligands. In order to assist the re- Department of Chemistry searcher searching for relevant information, this Introduction The Ohio State University is followed by a listing of Recent Reviews and Monographs on Columbus, OH, USA General Abbreviations Ac acetyl DIEA = DIPEA acac acetylacetonate DIOP 2,3-6Msopropylidene-2,3-dihydroxy-1,4-bis- AIBN 2,2/-azobisisobutyronitrile (diphenylphosphino)butane Ar aryl DIPEA diisopropylethylamine diphos =dppe BBN borabicyclo[3.3.1]nonane DIPT diisopropyl tartrate BCME dis(chloromethyl)ether DMA dimethylacetamide BHT butylated hydroxytoluene (2,6-di-f-butyl-/?- DMAD dimethyl acetylenedicarboxylate cresol) DMAP 4-(dimethylamino)pyridine BINAL-H 2,2'-dihydroxy-1, l'-binaphthyl-lithium DME 1,2-dimethoxyethane aluminum hydride DMF dimethylformamide BINAP 2,2'-bis(diphenylphosphino)-1,1 '-binaphthyl dmg dimethylglyoximato BINOL l,l'-bi-2,2'-naphthol DMPU A^Af'-dimethylpropyleneurea bipy 2,2/-bipyridyl DMS dimethyl sulfide BMS borane-dimethyl sulflde DMSO dimethyl sulfoxide Bn benzyl DMTSF dimethyl(methylthio) sulfonium B oc ^-butoxycarbonyl tetrafluoroborate BOM benzyloxymethyl dppb 1,4-bis(diphenylphosphino)butane bp boiling point dppe 1,2-bis(diphenylphosphino)ethane Bs brosyl (4-bromobenzenesulfonyl) dppf 1,1 /-bis(diphenylphosphino)ferrocene BSA N, O-bis(trimethylsilyl)acetamide dppp 1,3-bis(diphenylphosphino)propane Bu rc-butyl DTBP di-f-butyl peroxide Bz benzoyl EDA ethyl diazoacetate CAN cerium(IV) ammonium nitrate EDC 1 -ethyl-3-(3-dimethylaminopropyl)- Cbz benzyloxycarbonyl carbodiimide CDI A^W-carbonyldiimidazole EDCI =EDC CHIRAPHOS 2,3-bis(diphenylphosphino)butane ee enantiomeric excess Chx - Cy EE 1-ethoxyethyl cod cyclooctadiene Et ethyl cot cyclooctatetraene ETSA ethyl trimethylsilylacetate Cp cyclopentadienyl EWG electron withdrawing group CRA complex reducing agent CSA 10-camphorsulfonic acid Fc ferrocenyl CSI chlorosulfonyl isocyanate Fmoc 9-fluorenylmethoxycarbonyl Cy cyclohexyl fp flash point d density Hex n-hexyl DABCO 1,4-diazabicyclo[2.2.2]octane HMDS hexamethyldisilazane DAST MN'-diethylaminosulfur trifluoride HMPA hexamethylphosphoric triamide dba dibenzylideneacetone HOBt 1-hydroxybenzotriazole DBAD di-f-butyl azodicarboxylate HOBT =HOBt DBN l,5-diazabicyclo[4.3.0]non-5-ene HOSu jV-hydroxysuccinimide DBU l,8-diazabicyclo[5.4.0]undec-7-ene DCC A^A^-dicyclohexylcarbodiimide Im imidazole (imidazolyl) DCME dichloromethyl methyl ether Ipc isopinocampheyl DDO dimethyldioxirane IR infrared DDQ 2,3-dichloro-5,6-dicyano-1,4-benzoquinone de diastereomeric excess KHDMS potassium hexamethyldisilazide DEAD diethyl azodicarboxylate DET diethyl tartrate LAH lithium aluminum hydride DIBAL diisobutylaluminum hydride LD dose that is lethal to 50% of test subjects 50 LDA lithium diisopropylamide PMDTA AWA^A^'-pentamethyldiethylene- LDMAN lithium l-(dimethylamino)naphthalenide triamine LHMDS = LiHMDS PPA polyphosphoric acid LICA lithium isopropylcyclohexylamide PPE polyphosphate ester LiHMDS lithium hexamethyldisilazide PPTS pyridinium /7-toluenesulfonate LiTMP lithium 2,2,6,6-tetramethylpiperidide Pr rc-propyl LTMP = LiTMP PTC phase transfer catalyst/catalysis LTA lead tetraacetate PTSA p-toluenesulfonic acid lut lutidine py pyridine RAMP (R)-1 -amino-2-(methoxymethyl)pyrrolidine ra-CPBA ra-chloroperbenzoic acid rt room temperature MA maleic anhydride MAD methylaluminum bis(2,6-di-£-butyl-4- salen bis(salicylidene)ethylenediamine methylphenoxide) SAMP (S)-1 -amino-2-(methoxymethyl)pyrrolidine MAT methylaluminum bis(2,4,6-tri-£- SET single electron transfer butylphenoxide) Sia siamyl (3-methyl-2-butyl) Me methyl MEK methyl ethyl ketone TASF tris(diethylamino)sulfonium MEM (2-methoxyethoxy)methyl difluorotrimethylsilicate MIC methyl isocyanate TBAB tetrabutylammonium bromide MMPP magnesium monoperoxyphthalate TBAF tetrabutylammonium fluoride MOM methoxymethyl TBAD = DBAD MoOPH oxodiperoxomolybdenum(pyridine)- TBAI tetrabutylammonium iodide (hexamethylphosphoric triamide) TBAP tetrabutylammonium perruthenate mp melting point TBDMS /-butyldimethylsilyl MPM =PMB TBDPS f-butyldiphenylsilyl Ms mesyl (methanesulfonyl) TBHP r-butyl hydroperoxide MS mass spectrometry; molecular sieves TBS = TBDMS MTBE methyl J-butyl ether TCNE tetracyanoethylene MTM methylthiomethyl TCNQ 7,7,8,8-tetracyanoquinodimethane MVK methyl vinyl ketone TEA triethylamine TEBA triethylbenzylammonium chloride n refractive index TEBAC =TEBA NaHDMS sodium hexamethyldisilazide TEMPO 2,2,6,6-tetramethylpiperidinoxyl Naph naphthyl TES triethylsilyl NBA Af-bromoacetamide Tf triflyl (trifluoromethanesulfonyl) nbd norbornadiene (bicyclo[2.2.1]hepta- TFA trifluoroacetic acid 2,5-diene) TFAA trifluoroacetic anhydride NBS N-bromosuccinimide THF tetrahydrofuran NCS A^-chlorosuccinimide THP tetrahydropyran; tetrahydropyranyl NIS A^-iodosuccinimide Thx thexyl (2,3-dimethyl-2-butyl) NMO A^-methylmorpholine Af-oxide TIPS triisopropylsilyl NMP Af-methyl-2-pyrrolidinone TMANO trimethylamine N-oxide NMR nuclear magnetic resonance TMEDA ^,^,^,^-tetramethylethylenediamine NORPHOS bis(diphenylphosphino)bicyclo[2.2.1]-hept- TMG 1,1,33-tetramethylguanidine 5-ene TMS trimethylsilyl Np =Naph ToI p-tolyl TPAP tetrapropylammonium perruthenate PCC pyridinium chlorochromate TBHP f-butyl hydroperoxide PDC pyridinium dichromate TPP tetraphenylporphyrin Pent ft-pentyl Tr trityl (triphenylmethyl) Ph phenyl Ts tosyl (p-toluenesulfonyl) phen 1,10-phenanthroline TTN thallium(III) nitrate Phth phthaloyl UHP urea-hydrogen peroxide complex Piv pivaloyl PMB /?-methoxybenzyl Z =Cbz Contents Preface .................................................................................................................................... xi Introduction .............................................................................................................................. xiii General Abbreviations ............................................................................................................. xv 1. Recent Review Articles and Monographs .................................................................... 1 2. Organic Synthesis Procedures Featuring Chiral, Non-racemic Reagent Preparation, Volumes 68-78 ........................................................................................... 7 3. (S)-Aceto(carbonyl)(cyclopentadienyl)-(triphenylphosphine)iron to 2-Azabicyclo[2.2.1]hept-5-en-3-one ............................................................................... 21 3.1 (S)-Aceto(carbonyl)(cyclopentadienyl)-(triphenylphosphine)iron ....................................... 21 3.2 Allylcyclopentadienyl[(4R,trans)- and (4S,trans)-α,α,α’,α’-tetraphenyl-1,3-dioxolane- 4,5-dimethanolato-O,O’]titanium [Cp(R,R)-Ti[All] and Cp(S,S)-Ti[All]] ............................... 23 3.3 B-Allyldiisocaranylborane ................................................................................................... 26 3.4 (1R,2S)-1-Amino-2,3-dihydro-1H-inden-2-ol ....................................................................... 27 3.5 (S)-1-Amino-2-hydroxymethylindoline ................................................................................ 30 3.6 (S)-1-Amino-2-methoxymethylpyrrolidine ........................................................................... 32 3.7 2-Amino-3-methyl-1,1-diphenyl-1-butanol .......................................................................... 36 3.8 3-Amino-2,6,6-trimethylbicyclo[3.1.1]heptan-2-ol ............................................................... 38 3.9 (S)-4-Anilino-3-methylamino-1-butanol ............................................................................... 40 3.10 (S)-2-(Anilinomethyl)pyrrolidine .......................................................................................... 41 3.11 L-Aspartic Acid .................................................................................................................... 42 3.12 2-Azabicyclo[2.2.1]hept-5-en-3-one .................................................................................... 44 4. Baker’s Yeast to (R)-(+)-t-Butyl 2-(p-Tolylsulfinyl)propionate .................................... 45 4.1 Baker’s Yeast ...................................................................................................................... 45 4.2 (1R,5R)-2H-1,5-Benzodithiepin-3(4H)-one 1,5-Dioxide ...................................................... 48 4.3 1-Benzoyl-2-t-butyl-3,5-dimethyl-4-imidazolidinone ............................................................ 50 4.4 (2S,4S)-3-Benzoyl-2-t-butyl-4-methyl-1,3-oxazolidin-5-one ............................................... 51 4.5 1-Benzoyl-2(S)-tert-butyl-3-methylperhydropyrimidin-4-one ............................................... 53 4.6 Benzyl(methoxymethyl)methylamine .................................................................................. 56 4.7 (S)-4-Benzyl-2-oxazolidinone ............................................................................................. 57 4.8 N-Benzyloxycarbonyl-L-serine β-Lactone ........................................................................... 68 vii viii Contents 4.9 2-[2-[(Benzyloxy)ethyl]-6,6-dimethylbicyclo[3.3.1]-3-nonyl]-9-borabicyclo[3.3.1]nonane .... 70 4.10 (R,R)-1-(2’-Benzyloxymethylphenyl)-2,5-dimethylphospholane ......................................... 71 4.11 N-Benzylquininium Chloride ............................................................................................... 72 4.12 (S)-4-Benzyl-2,2,5,5-tetramethyloxazolidine ....................................................................... 73 4.13 (Bicyclo[2.2.1]hepta-2,5-diene)[(2S,3S)-bis(diphenylphosphino)butane]rhodium Perchlorate ......................................................................................................................... 74 4.14 (Bicyclo[2.2.1]hepta-2,5-diene)[1,4- bis(diphenylphosphino)butane]rhodium(I)Tetrafluoroborate ............................................... 76 4.15 (1R,1’R,2R,2’R)-[1,1’-Bicyclopentyl-2,2’-diylbisdiphenylphosphine] ................................... 81 4.16 1,1’-Binaphthalene-2,2’-dithiol ............................................................................................ 83 4.17 (R)-1,1’-Bi-2,2’-naphthol ..................................................................................................... 86 4.18 (R)-1,1’-Bi-2,2’-naphthotitanium Dichloride ......................................................................... 91 4.19 (R)-1,1’-Bi-2,2’-naphthotitanium Diisopropoxide ................................................................. 94 4.20 (S)-2,2’Binaphthoyl(R,R)-di(1-phenylethyl)aminoylphosphine ........................................... 95 4.21 1,1’-Binaphthyl-2,2’-diyl Hydrogen Phosphate .................................................................... 97 4.22 Bis(α-camphorquinone dioximato)cobalt ............................................................................ 98 4.23 (R,R)-1,2-Bis(aminocarbonylphenyl-2’-diphenylphosphino)cyclohexane ........................... 99 4.24 Bis(bicyclo[2.2.1]hepta-2,5-diene)-rhodium Perchlorate-(R)-1-(S)-1’,2- Bis(diphenylphosphino)ferrocenylethanol ........................................................................... 104 4.25 (1S,9S)-1,9-Bis{[(t-butyl)dimethylsilyloxy]methyl}-5-cyanosemicorrin ................................ 105 4.26 (R,R)-Bis(tert-butylmethylphosphino)methane ................................................................... 107 4.27 2,2-Bis{[2-[4(S)-tert-butyl-1,3-oxazolinyl]}propane .............................................................. 108 4.28 Bis(cyclohexyl isocyanide)gold(I) Tetrafluoroborate-(R)-N-[2-(N,N-Dimethylamino)ethyl]- N-methyl-1-(S)-1’,2-bis(diphenylphosphino)ferrocenyl]ethylamine ..................................... 115 4.29 Bis(1,5-cyclooctadiene)rhodium Tetrafluoroborate-(R)-2,2’Bis(diphenylphosphino)- 1,1’-binaphthyl .................................................................................................................... 118 4.30 (S,S)-1,2-Bis(2,5-diethylphospholano)benzene .................................................................. 119 4.31 1,2-Bis((2S,5S)-2,5-dimethylphospholano)benzene (S,S)-Me-DuPhos, 1,2-Bis((2R,5R)2,5-dimethylphospholano)benzene (R,R)-Me-DuPhos .............................. 123 4.32 [Bis(4R,5S)-4,5-diphenyl-1,3-oxazolin-2-yl]methane [Bis(4S,5R)-4,5-diphenyl-1,3- oxazolin-2-yl]methane ......................................................................................................... 126 4.33 (R)- & (S)-2,2’-Bis(diphenylphosphino)-1,1’-binaphthyl ...................................................... 128 4.34 (2R,3R)-2,3-Bis(diphenylphosphino)butane ....................................................................... 132 4.35 (R)-7,7’-Bis(diphenylphosphinomethyl)-2,2’-dimethoxy-1,1’-binaphthyl ............................. 133 4.36 (η5,η5-1S,2R,4S,5R-1,4-Bis(indenyl)-2,5-diisopropylcyclohexane)titanium Dichloride ....... 134 4.37 2,6-Bis[(4S)-4-isopropyloxazolin-2-yl]pyridine .................................................................... 135 4.38 2,6-Bis[(S)-4’-isopropyloxazolin-2’-yl](pyridine)rhodium Trichloride ................................... 136 4.39 trans-2,5-Bis(methoxymethyl)pyrrolidine ............................................................................ 138 4.40 Bis[(4S)-(1-methylethyl)oxazolin-2-yl]methane ................................................................... 140 4.41 (R)-3,3’-Bis(triphenylsilyl)binaphthomethylaluminum .......................................................... 144 4.42 (–)-endo-Bornyltriazolinedione ............................................................................................ 145

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