2-(di)halobutadienes undergo BF3 catalysed cycloadditions with methyl vinyl ketone at 25°C, to give good yields of adducts in which the regiochemistry of addition is mainly controlled by the sulfur (selenium) atom.
3-PhS(e)-(1),2-(di)卤代
丁二烯在25°C下与
甲基乙烯基酮进行BF 3催化的环加成反应,以提供良好的加合物收率,其中加成的区域
化学主要由
硫控制(
硒)原子。