摘要:

AbstractThe reactions of cyanic esters with acylating agents and the reactions of the resultingN‐acyliminocarbonic ester halides are surveyed, and syntheses of heterocycles with cyanic esters and their reaction products are then reporte

ISSN:0570-0833    

DOI:10.1002/anie.197209491

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractProton‐active substances react with certain electron‐rich olefins with cleavage of the central CC double bond to give compounds that can be formally regarded as insertion products of nucleophilic carbenes. If they satisfy certain structural conditions, they isomerize with β elimination to give open‐chain compounds. Both CH‐acidic compounds and compounds containing NH or OH groups can undergo this reaction. The mechanisms are discussed, and the importance of the intermediate products to biochemistry (thiamine, tetrahydrofolic acid) is

ISSN:0570-0833    

DOI:10.1002/anie.197209641

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe present article deals with the primary photochemical reactions of carbonyl compounds commonly used as photoinitiators. It is shown that radical formation results mainly from three processes, i.e. hydrogen abstraction, β‐cleavage, and α‐cleavage. The difference in the suitability of the radicals for chain initiation is disc

ISSN:0570-0833    

DOI:10.1002/anie.197209741

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractSince it is often necessary or desirable to determine the structures of compounds containing nitrogen directlyviathe nitrogen atoms, the nuclear quadrupole resonance (NQR) and the nuclear magnetic resonance (NMR) as well as the photoelectron and the Auger‐electron spectroscopy (ESCA) of nitrogen are becoming increasingly important. A comparative review of these three methods on the basis of measurement effect, information obtainable, applications, and limitations forms the subject of this articl

ISSN:0570-0833    

DOI:10.1002/anie.197209791

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractIn matrix reactions in swellable cellular matrixes, the solids formed are oriented in space and arranged in the form of cells in strong three‐dimensional growth processes. Open‐cell, flexible, elastic polyurethanes have a particularly good matrix action. The principle is of general validity, and can be realized with a wide variety of matrixes and reaction types. The dimensional changes, which are always symmetrical, are largely determined by the chemical constitution of the matrix, segment structure, degree of crosslinking, and solvation and hydration behavior. One‐component reactions having high rates give sigmoid growth curves and exhibit parallels with growth curves of plant cell walls containing cell

ISSN:0570-0833    

DOI:10.1002/anie.197209901

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractPhenylcyclobutenediones are easily obtainable and very stable. Depending on the nature of the substituent R in position 3, they may be formally regarded as vinylogous carboxylic acid derivatives (Rhalogen, OCH3, OH, SH) or as α,β‐unsaturated diketo compounds (RH, alkyl, aryl). Their behavior in reactions justifies this approach. Ring contraction, ring expansion, and ring cleavage reactions are de

ISSN:0570-0833    

DOI:10.1002/anie.197209971

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197210092

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197210101

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197210112

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197210121

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY