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Titolo:
Methyl, ethyl, isopropyl and tert-butyl 3-oxo-2-(triphenylphosphoranylidene)butyrates, a common pattern a preferred conformation
Autore:
Castaneda, F; Terraza, CA; Garland, MT; Bunton, CA; Baggio, RF;
Indirizzi:
Comis Nacl Energia Atom, Dept Fis, RA-1429 Buenos Aires, DF, Argentina Comis Nacl Energia Atom Buenos Aires DF Argentina RA-1429 , DF, Argentina Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara Santa Barbara CA USA 93106 Barbara, CA 93106 USA Univ Chile, Fac Ciencias Fis & Matemat, Dept Fis, Santiago, Chile Univ Chile Santiago Chile cias Fis & Matemat, Dept Fis, Santiago, Chile Univ Chile, Fac Ciencias Quim & Farmaceut, Dept Quim Organ & Fisicoquim, Santiago, Chile Univ Chile Santiago Chile Dept Quim Organ & Fisicoquim, Santiago, Chile
Titolo Testata:
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS
, volume: 57, anno: 2001,
parte:, 2
pagine: 180 - 184
SICI:
0108-2701(200102)57:<180:MEIAT3>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRYSTAL-STRUCTURE; WITTIG REACTION; PHOSPHORANES; ANHYDRIDES; C-13;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Baggio, RF Comis Nacl Energia Atom, Dept Fis, RA-1429 Buenos Aires, DF, Argentina Comis Nacl Energia Atom Buenos Aires DF Argentina RA-1429 tina
Citazione:
F. Castaneda et al., "Methyl, ethyl, isopropyl and tert-butyl 3-oxo-2-(triphenylphosphoranylidene)butyrates, a common pattern a preferred conformation", ACT CRYST C, 57, 2001, pp. 180-184

Abstract

The crystal structures of four alkyl 3-oxo-2-(triphenylphosphoranylidene)butyrates, where the alkyl group is methyl (C23H21O3P .0.5C(6)H(6)), (II), ethyl (C24H23O3P), (III), isopropyl (C25H25O3P), (IV), or tert-butyl (C26H27O3P), (V), show all of them to have the same conformation. They present a tetrahedral P atom and an sp(2) ylidic C atom, with the carbonyl groups adopting anti conformations with respect to the keto groups located close to the P atom. P-C-C-O torsion angles, bond lengths and angles indicate an effective electronic delocalization toward the keto groups. In each case, one H atom of the alkoxy group is close to one of the phenyl rings. These preferred conformations are evaluated as the result of attractive and repulsive intramolecular interactions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 21:32:14