catalytic tandem process involving a ring-closing carbonyl-olefin metathesis and a transfer hydrogenation are described. 1,4-Cyclohexadiene has been used as an H2 surrogate to reduce the cyclic alkenes formed after the metathesis step. The same cationic gallium(III) complex, [IPr·GaCl2][SbF6], performs the two steps with functional group tolerance. This stereoselective reaction leads to 1,2-cis-disubstituted
Radical translocation reactions of vinyl radicals: substituent effects on 1,5-hydrogen-transfer reactions
作者:Dennis P. Curran、Wang Shen
DOI:10.1021/ja00067a021
日期:1993.7
systematic study of the radicaltranslocation (1,5-hydrogen-transfer) reactions of vinylradicals is described. The effects of monoalkoxy, dialkoxy, monoalkylthio, dialkylthio, thiohemiketal, phenyl, allyl, carboxylate ester, nitrile, and tertiary, secondary, and primary alkyl substituents on the transferring C-H bond were studied. The protocol was first to generate vinylradicals which were next translocated