Highly Z-Selective Metathesis Homocoupling of Terminal Olefins
摘要:
Mo and W MonoAryloxide-Pyrrolide (MAP) otefin metathesis catalysts can couple terminal olefins to give as high as >98% Z-products in moderate to high yields with as little as 0.2% catalyst. Results are reported for 1-hexene, 1-octene, allylbenzene, allyltrimethylsilane, methyl-10-undecenoate, methyl-9-decenoate, allylB(pinacolate), allyloBenzyl, allylNHTosyl, and allylNHPh. It is proposed that high Z-selectivity is achieved because a large aryloxide only allows metallacyclobutanes to form that contain adjacent cis substituents and because isomerization of Z-product to E-product can be stow in that same steric environment.
Highly <i>Z</i>-Selective Metathesis Homocoupling of Terminal Olefins
作者:Annie J. Jiang、Yu Zhao、Richard R. Schrock、Amir H. Hoveyda
DOI:10.1021/ja908098t
日期:2009.11.25
Mo and W MonoAryloxide-Pyrrolide (MAP) otefin metathesis catalysts can couple terminal olefins to give as high as >98% Z-products in moderate to high yields with as little as 0.2% catalyst. Results are reported for 1-hexene, 1-octene, allylbenzene, allyltrimethylsilane, methyl-10-undecenoate, methyl-9-decenoate, allylB(pinacolate), allyloBenzyl, allylNHTosyl, and allylNHPh. It is proposed that high Z-selectivity is achieved because a large aryloxide only allows metallacyclobutanes to form that contain adjacent cis substituents and because isomerization of Z-product to E-product can be stow in that same steric environment.