期刊
CATALYSIS LETTERS
卷 92, 期 3-4, 页码 123-130出版社
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/B:CATL.0000014334.73726.d3
关键词
trimethylcyanation; Ti(IV) salen; enantioselectivity; immobilization
A new heterogeneous system for catalytic trimethylsilylcyanation of benzaldehyde has been developed by immobilizing Ti(IV) salen onto ordered mesoporous silica (MCM-41). The immobilization was performed according to different methods: (i) direct condensation of silanol on the silica surface with Ti( IV) salen and (ii) multigrafting of salicylaldehyde derivatives and diaminocyclohexane using 3-mercaptopropyl-functionalized MCM-41 as a starting material. The heterogenized salen catalysts showed a high enantioselectivity for the addition of trimethylsilyl cyanide to benzaldehyde.
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