Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
SYNTHESIS, CHARACTERIZATION, AND APPLICATION OF HELICAL POLYMERS
Autore:
OKAMOTO Y;
Indirizzi:
NAGOYA UNIV,SCH ENGN,DEPT APPL CHEM,CHIKUSA KU,FURO CHO NAGOYA AICHI 46401 JAPAN
Titolo Testata:
Macromolecular symposia
, volume: 101, anno: 1996,
pagine: 343 - 354
SICI:
1022-1360(1996)101:<343:SCAAOH>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SENSE-SELECTIVE POLYMERIZATION; ISOTACTIC CHLORAL OLIGOMERS; ASYMMETRIC POLYMERIZATION; MACROMOLECULAR STEREOCHEMISTRY; N,N-DISUBSTITUTED ACRYLAMIDES; ACHIRAL ISOCYANIDES; POLYISOCYANATES; CONFORMATION; EQUILIBRIUM; INITIATORS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
Y. Okamoto, "SYNTHESIS, CHARACTERIZATION, AND APPLICATION OF HELICAL POLYMERS", Macromolecular symposia, 101, 1996, pp. 343-354

Abstract

This review mainly describes the asymmetric synthesis of optically active polymers with helical conformation. Bulky methacrylates such as triphenylmethyl methacrylate and 1-phenyldibenzosuberyl methacrylate give one-handed helical and optically active polymers with almost perfectly isotactic main chain conformation by polymerization with chiral anionic initiators. The radical polymerization and copolymerization of these monomers under chiral conditions also afford optically active polymers with prevailing one-handed helicity. N,N-Disubstituted acrylamides also give optically active, helical polymers in the asymmetric anionic polymerization. Optically active polyisocyanates with a prevailingone-handed helical structure have been prepared in the copolymerization of an achiral isocyanate with a small amount of an optically activeisocyanate and also in the polymerization of alkyl and aromatic isocyanates with optically active lithium alkoxide or amide compounds. The existence of a stable helical structure for polychloral has been successfully proved with the helical oligomers of chloral. One-handed helical polyisocyanides have been prepared by helix-sense-selective polymerization of bulky isocyanides and also by the cyclopolymerization of a 1,2-diisocyanobenzene derivative with the Pd complex of a one-handed helical oligomer.

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Documento generato il 01/12/20 alle ore 16:46:58