Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
GERMYLENES AS MONOMERS FOR POLYMER SYNTHESIS
Autore:
KOBAYASHI S; SHODA SI; CAO S; IWATA S; ABE M; YAJIMA K; YAGI K; HIRAISHI M;
Indirizzi:
TOHOKU UNIV,FAC ENGN,DEPT MOLEC CHEM & ENGN SENDAI MIYAGI 980 JAPAN
Titolo Testata:
Journal of macromolecular science. Pure and applied chemistry
fascicolo: 11, volume: A31, anno: 1994,
pagine: 1835 - 1845
SICI:
1060-1325(1994)A31:11<1835:GAMFPS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(GERMANIUM ENOLATE); COPOLYMERIZATION; POLYGERMANES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
S. Kobayashi et al., "GERMYLENES AS MONOMERS FOR POLYMER SYNTHESIS", Journal of macromolecular science. Pure and applied chemistry, A31(11), 1994, pp. 1835-1845

Abstract

Germylenes have been utilized as monomers for polymer synthesis for the first time. The construction of a repeating unit of O-Ge-O, O-Ge-Ge-O, O-Ge-C, and C-Ge-C as well as the formation of polygermane have been achieved on the basis of new concepts of ''oxidation-reduction copolymerization'' and ''ligand substitution polymerization. '' The former involves a redox process between a germylene (reductant monomer, M(red)) and an oxidant monomer (M(OX)). The M(OX) employed are p-benzoquinone derivatives, cyclic alpha,beta-unsaturated ketones, and substitutedacetylenes. During the copolymerization, the germylene (M(red)) is oxidized and the M(OX) is reduced (''oxidation-reduction copolymerization''). The reaction mechanism between germylenes and p-benzoquinone derivatives has been elucidated as copolymerization proceeding via a biradical propagating species involving a germyl radical and/or a semiquinone radical. This is, to our best knowledge, the first clear-cut evidence for a biradical mechanism in polymerization chemistry. A new type of polymerization for the synthesis of polygermanes has been established by the reaction of germanium dichloride and various alkyllithium compounds (''ligand substitution polymerization'').

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 13:49:40