摘要:

AbstractDye molecules containing two or more polymethine structural units, or at least one polymethine and one polyene structural unit, generally exhibit coupling effects that determine the spectroscopic behavior and other physicochemical properties of the substance. The coupling concept can be used inter alia to fit the quinone dyestuffs, the indigoids, and the indanthrenes into a general poymethine color system and to perdict new dye structures.

ISSN:0570-0833    

DOI:10.1002/anie.196609841

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractPolymers containing intact lactone groups are a new class of macromolecules with reactive groups, which are relatively easy to obtain by polymerization, polycondensation and polyaddition, as well as by reactions on existing macromolecules. Polymers with β‐lactone Groups in particular can enter into numerous addition reactions, which can be used, for example, to obtain macromolecules containing hydroxy acid or amino acid groupings. The reactions proceed under mild conditions, and can even be carried out in aqueous media, frequently giving water‐soluble polymers. The polymers can be cross‐linked at low temperatures, even from the aqueous phase, by the addition of bifunctional or oligofunctional reagents. Polymers containing β‐lactone groups can also be used as a basis for graft co‐polymers; polyester or polyether branches can be grafted on, depending on whether monomeric lactones or monomeric epoxid

ISSN:0570-0833    

DOI:10.1002/anie.196609941

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe stereochemistry of the various chemical grouping which constitute the structural units of ring systems is first reviewed. It is then shown that the strain‐free possibilities even of large rings are restricted, and that the ring conformation theoretically derived generally correspond to those found by physical methods. Variations of physical properties and of cyclization yield in homologous series are explained on a conformational basi

ISSN:0570-0833    

DOI:10.1002/anie.196610001

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThis review deals with inorganic, organometallic, and organic compounds, as well as with elements, that on the basis of their electronic structure and their reactions can be regarded formally as analogues of carbenes. These “carbene analogues” include in particular the compounds of monovalent boron, aluminum, nitrogen, and phosphorus; those of divalent silicon, germanium, tin, and lead; atomic oxygen; atomic sulfur; and atomic selenium. The preparation and chemical properties of the carbenes and their analogues are compa

ISSN:0570-0833    

DOI:10.1002/anie.196610211

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196610381

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196610392

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196610401

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196610412

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196610422

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196610431

出版商:Hüthig&Wepf Verlag    

年代:1966

数据来源: WILEY