ChemInform Abstract: Binary Caesium‐Lanthanum Oxide Supported on MCM‐41: A New Stable Heterogeneous Basic Catalyst.

Abstract

Binary Caesium-Lanthanum Oxide Supported on MCM-41: A New Stable Heterogeneous Basic Catalyst.-The new title catalyst is prepared by wet or solid state impregnation of the mesoporous molecular sieve MCM-41 with CsOAc and La(NO3)3· 6H2O followed by drying and calcination. The application of CsLa/MCM-41 materials, which possess thermally stable, small, intraporous CsLaOx clusters, as basic catalysts is demonstrated for the Knoevenagel addition of enolates to benzaldehyde in aqueous media. The presence of La and the mesoporous framework control the product selectivity in the Michael addition of ethyl cyanoacetate to ethyl acrylate. The catalyst can be regenerated. -(KLOETSTRA, K. R.; VAN LAREN, M.; VAN BEKKUM, H.; J.