Metal cation-exchangedmontmorillonite (Mn+-Mont)-catalysedcarbonyl-ene reactions

J Tateiwa, A Kimura, M Takasuka…

Index: Tateiwa, Jun-Ichi; Kimura, Akihiro; Takasuka, Masaaki; Uemura, Sakae Journal of the Chemical Society - Perkin Transactions 1, 1997 , # 15 p. 2169 - 2174

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Citation Number: 42

Abstract

Metal cation-exchanged montmorillonite (M n+-mont) works in acetonitrile at 80° C as a Lewis acid catalyst for the intermolecular carbonyl-ene reaction of α-methylstyrenes with paraformaldehyde to give the corresponding homoallylic alcohols, Zr 4+-mont being the most effective of the many M n+-mont catalysts examined. Similarly, the catalyst is also useful for the highly stereoselective intramolecular cyclization of citronellals to afford ...

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