Diene Condensation on Zeolites, II. Influence of the Zeolite Structure and the Nature of Substituting Cation on the Reaction of Alloocimene with α-Methacrolein
Reaction Kinetics and Catalysis Letters
, E-ISSN: 1588-2837
||Alloocimene, Diene condensation, Zeolite © akadémiai kiadó, α-methacrolein
Federal Scientific Center, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
Institute of Organic Chemistry, Novosibirsk 630090, Russia
The interaction of alloocimene with α-methacrolein on β-zeolite with various substituent cations (Fe, Ni, Zn, Cu and La) as well as on ZSM-5, erionite and mordenite has been studied at room temperature in dichloromethane. Substituent cations in β-zeolite as well as the silica/alumina ratio and alkali metal content in the zeolite structure were found to affect the formation of ocinal diastereomers. Therefore, we assume that a complex of active sites participates in the diene condensation: Alkali metals present in the zeolite suppress the (3+2)-cycloaddition reaction.