CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
artículos
Título:
Acylating Capacity of the Fosfotungstic Wells-Dawson Heteropoly-acid: Intermediate Reactive Species.
Autor/es:
SEBASTIÁN E. COLLINS, SILVANA R. MATKOVIC, ADRIAN L. BONIVARDI, AND LAURA E. BRIAND
Revista:
JOURNAL OF PHYSICAL CHEMISTRY C
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2011 vol. 115 p. 700 - 700
ISSN:
1932-7447
Resumen:
The mechanism of adsorption and decomposition of acetic anhydride over phosphotungstic Wells-Dawson heteropoly acid (HPA) was investigated through infrared spectroscopy with especially dedicated in situ cells. Both gaseous and liquid acetic anhydride dissociatively chemisorbs on the heteropoly acid, producing the intermediate acyl CH3CO+ species, adsorbed acetate species, and acetic acid. The former is known as the key intermediate species in the Friedel-Crafts acylation reaction. Moreover, the consumption of the Brønsted acid sites observed during the adsorption and decomposition of acetic anhydride over the HPA indicates that those sites are the active ones of the genesis of the acyl intermediate species. Surface acetate species and acetic acid strongly adsorb on the active acid sites deactivating the heteropoly acid.
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