A novel preparation of crowded olefins by neopentylidenation of polycycloalkanes is reported. The corresponding polycycloalkanones are first converted into their dibromomethylene derivatives via carbon tetrabromide/triphenylphosphine. Subsequent treatment with tert-butyllithium affords the desired neopentylidenepolycycloalkanes in good yield.
报告了一种通过多环
烷烃的新
戊烯化反应制备多元烯烃的新方法。首先通过
四溴化碳/
三苯基膦将相应的多环烷酮转化为其二
溴亚甲基衍
生物。随后用
叔丁基锂进行处理,可以得到所需的新亚戊基多环烷,收率很高。