Rezaeifard A, * Haddad R, Jafarpour M, * Hakimi M. * University of Birjand and Payame Noor University, Tehran, Iran
Catalytic Epoxidation Activity of Keplerate Polyoxomolybdate Nanoball toward Aqueous Suspension of Olefins under Mild Aerobic Conditions.
J. Am. Chem. Soc. 2013;
135: 10036-10039
Key words
epoxidation - polyoxomolybdate nanoball - aerobic conditions - heterogeneous catalysis
Significance
The aerobic epoxidation of olefins in aqueous solution takes place with the Keplerate-type polyoxomolybdate Mo132 catalyst 1 under oxygen to give the corresponding products 2a–h in up to 97% yield. In contrast, MoO3, (NH4)6Mo7O24, and Na2MoO4 showed no catalytic activity under similar conditions.
Comment
The Mo132 nanoball decomposed at pH >8. The decomposed material had no catalytic activity for the epoxidation. The Mo132 nanoball catalyst 1 was readily recovered as an aqueous solution and reused nine times without significant loss of its catalytic activity. The solid Mo132 catalyst was also readily recovered by removal of water.
