Transfer hydrogenation of unsaturated ketones catalyzed by Al-iso-propoxide dispersed on MCM-41

摘要

Aluminium alkoxides were anchored in the pores of siliceous MCM-41 type materials. The resulting catalysts were used in the hydrogen transfer reduction of α,β-unsaturated ketones to the corresponding allylic alcohols. The most active material is obtained by exposure of MCM-41 to a toluene solution of Al(OPr~i)_3. With benzalacetone (4-phenyl-3-buten-2-one) as a model substrate;optimum reaction conditions are cyclopentanol (hydride donor);toluene (solvent);and addition of 5A molecular sieve (water trapping).