reaction of bis(p-chlorobenzylidine)acetone was confirmed by X-ray crystallography. Whilst bis-α,β−unsaturated ketones give rise to a single homoallylcyclopropane species, α,β-unsaturated ketones and aldehydes give diastereomeric mixtures whose relative stereochemistry were assigned by NOE experiments. Crotylindium reagents react with good to perfect regioselectivity to afford tetrasubstituted cyclopropanes
烯丙基试剂由过量的烯丙基卤化物(Br 或 I)和
铟金属制备,与 α,β-不饱和酮和醛反应,经过有氧酸性处理后,得到高烯丙基取代的
乙烯基环丙烷。该过程是在 Pd 催化过程中的副反应偶然发现后探索和开发的。由双(对
氯苄基)
丙酮反应产生的
环丙烷的结构已通过 X 射线晶体学证实。虽然双-α,β-不饱和酮产生单一的高烯
丙基环丙烷物质,但α,β-不饱和酮和醛产生非对映异构混合物,其相对立体
化学由 NOE 实验指定。