The nano-Al2O3-promoted epoxidation of alkenes with molecular oxygen as the oxidant has been developed, providing an efficient route to a variety of epoxides in moderate to excellent yields. The environmentally friendly and efficient nano-Al2O3 catalyst could be easily recovered and reused five times without significant loss of activity.
Epoxidation of Olefms with Molecular Oxygen and Alcohol Catalyzed by Bis(2-alkyl-1,3-diketonato)oxovanadium(IV)
作者:Toshihiro Takai、Tohru Yamada、Teruaki Mukaiyama
DOI:10.1246/cl.1990.1657
日期:1990.9
By combined use of molecular oxygen (oxidant) and secondary or primary alcohol (reductant) in the presence of a catalytic amount of bis(2-alkyl-1,3-diketonato)oxovanadium(IV) complexes, norbornene analogues are monooxygenated into the corresponding epoxides in good yields.
In the presence of a catalytic amount of cobalt(II)-Schiff base complexes, various olefins are smoothly oxygenated into the corresponding epoxides in good to high yields by combined use of an atmospheric pressure of oxygen (oxidant) and cyclic ketones (reductant), such as 2-methylcyclohexanone, under mild conditions.
In the presence of a catalytic amount of bis[1,3-di(p-methoxyphenyl)-1,3-propanedionato]nickel(II) (=Ni(dmp)2), various olefins are smoothly monooxygenated into corresponding epoxides in good yields with combined use of molecularoxygen and primary alcohol.