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Titolo:
Novel polymer effect in cleavage reactions of acetals and silyl ethers in aqueous media catalyzed by a polymer-supported dicyanoketene acetal
Autore:
Masaki, Y; Yamada, T; Tanaka, N;
Indirizzi:
Gifu Pharmaceut Univ, Gifu 5028585, Japan Gifu Pharmaceut Univ Gifu Japan 5028585 maceut Univ, Gifu 5028585, Japan
Titolo Testata:
SYNLETT
fascicolo: 8, , anno: 2001,
pagine: 1311 - 1313
SICI:
0936-5214(200108):8<1311:NPEICR>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALDIMINE-SELECTIVE REACTIONS; CARBON BOND FORMATION; PI-ACID CATALYST; FUNCTIONALIZED POLYMERS; ORGANIC-CHEMISTRY; MONOTHIOACETALIZATION; COEXISTENCE; ALDEHYDES; EPOXIDES;
Keywords:
polymeric dicyanoketene acetal; polymer effect; catalysis in aqueous media; deacetalization; desilylation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Masaki, Y Gifu Pharmaceut Univ, 5-6-1 Mitahora Higashi, Gifu 5028585, Japan Gifu Pharmaceut Univ 5-6-1 Mitahora Higashi Gifu Japan 5028585
Citazione:
Y. Masaki et al., "Novel polymer effect in cleavage reactions of acetals and silyl ethers in aqueous media catalyzed by a polymer-supported dicyanoketene acetal", SYNLETT, (8), 2001, pp. 1311-1313

Abstract

Deprotecting reactions of acetals including acetonides. ethylene acetals, and THP ethers of alcohols, an aldehyde, and ketones, and silyl ethers of primary and secondary alcohols were investigated using dicyanoketene acetals(DCKA) and a polymer-supported DCKA as a pi -acid promoter in aqueous acetonitrile and a single aqueous medium. In all reactions catalytic activity of the Polymer-supported DCKA was found to be much higher than that of the molecular DCKAs and an excellent polymer effect was observed. Particularly in the deacetalization reactions in water, difference of catalytic efficiency between the polymer-supported DCKA and the molecular DCKAs was remarkable.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 04:43:13