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Silica and alumina modified by Lewis acids as catalysts in Diels-Alder reactions of carbonyl-containing dienophiles

✍ Scribed by Carlos Cativiela; José M. Fraile; José I. García; José A. Mayoral; Elisabet Pires; Ana J. Royo; François Figueras; Louis C. de Ménorval

Publisher: Elsevier Science
Year: 1993
Tongue: French
Weight: 675 KB
Volume: 49
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(01)89919-1

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✦ Synopsis

Several ahunini~ and titanium derivatives are supported on silica and alumina. Some of the solids obtained contain strong Lewis adds sites and are eft%ient catalysts in Diels-Alder reactions of carbonyl-containing dienophiles. In cyclopentadiene reactions, high conversions and endo/exo selectivities are obtained in short reaction times, without excess of diene and with a small amount of catalyst at room temperaturn. With less reactive dknes, temperature, diene proportion and reaction times must be increased. However, high regio and endo/exo selectivities are obtained. The catalyst obtained by treatment of silica with diethyl ahuninium chloride retains a great deal of its catalytic activity when recovered or stored in the open air for one month.

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