Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9608012 | Applied Catalysis A: General | 2005 | 8 Pages |
Abstract
Highly selective epoxidation of allyl acetate was carried out over MoO3/MgO using tert-butyl hydroperoxide as an oxidizing agent. The catalytically active species was identified as monolayer MgMoO4 on MgO. MgO with large pores is suitable for selective epoxide formation. The highest yield of glycidyl acetate was obtained over 7Â wt.% MoO3/MgO, in which MgMoO4 species were highly dispersed on the surface of MgO. Trialkyl borates were good promoters for selective epoxide formation. Among them, triisopropyl borate afforded the highest yield of 92%. 1H and 11B NMR measurements of a homogeneous MoO2(acac)2-B(OBun)3-(t-C4H9OOH) system showed that alkyl groups of the borate exchange with t-butyl hydroperoxyl group, and that the boron atom interacts with the oxygen of MoO, promoting reactivity of an oxygen atom in the hydroperoxyl group to attack the double bond of allyl acetate.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Kenta Shimura, Hiroyoshi Kanai, Kazunori Utani, Kazuo Matsuyama, Seiichiro Imamura,