were easily prepared in situ from alkynes, reacted with acrolein diethylacetal to afford vinyl ether derivatives. The C–C bond formation proceeded exclusively at β-position of the α,β-unsaturated acetal. Zirconium catalyzed C–C bond formation reactions of α,β-unsaturated acetals with EtMgBr also proceeded at β-position exclusively.
锆-炔配合物或
锆环戊烯很容易从炔原位制备,与
丙烯醛二
乙缩醛反应得到
乙烯基醚衍
生物。C-C 键的形成仅在 α,β-不饱和
缩醛的 β 位进行。
锆催化的α,β-不饱和
缩醛与EtMgBr 的C-C 键形成反应也仅在β-位进行。