the enolate of a σ-ethylenic malonate with an unsaturated ioded in the presence of a Palladium(O) complex leads stereospecifically to a cyclopentane with the simultaneous formation in a trans fashion of the two carbon—carbon bonds. All the results authorize to conclude that this cyclisation occurs by nucleophilic attack of the enolate onto the double bond activated by the σ-palladic unsaturated species
在
钯(O)配合物的存在下用不饱和
碘处理不饱和
碘的烯属
丙二酸酯的烯醇化物导致立体定向生成
环戊烷,同时以反式方式形成两个碳-碳键。所有的结果都可以得出结论,该环化是通过烯醇盐对σ-palladic不饱和物质激活的双键的亲核攻击而发生的。