A C60 derivative bearing an organofluorine tail through the dimethylsilyl moiety (1) was proved to be an efficient photosensitizer in C6F6. Photooxygenation of olefins or dienes was accomplished by catalysis of 1 (0.5–1.5 mol%) at room temperature under an oxygen atmosphere.
Cobalt catalyzed regioselective allylation of 1,3-dicarbonyl compounds
作者:Golak C. Maikap、M. Madhava Reddy、Manoj Mukhopadhyay、Beena Bhatia、Javed Iqbal
DOI:10.1016/s0040-4020(01)85380-1
日期:1994.1
Catalytic amount of Cobalt(II) chloride in 1,2-dichloroethane promotes the allylation of 1,3-dicarbonyl compounds with allyl acetates in high yields. The allylation of pentane-2,4-dione is highly regioselective as compared with methylacetoacetate and ethyl 2-oxocyclopentanecarboxylate.
The first synthetic application of Ti(IV)–calix[4]arenes as catalysts in regio- and stereoselective epoxidation of allylicalcohols is reported. The catalytic properties of these Ti(IV) complexes are dramatically enhanced in the presence of activated 4 Å molecularsieves.