employed. That is, while a cyclodimerization of allenyne proceeded to give a pentacyclic compound in toluene, a bicyclo[4.2.0]octa-1(8),5-diene derivative was exclusively produced by [2 + 2] cycloaddition of allenyne in methanol. It was also demonstrated that the [2 + 2] cycloaddition was catalyzed by a cationic ruthenium complex generated from Cp*RuCl(cod) and methanol in situ.
根据所使用的溶剂类型,Cp * RuCl(cod)催化的烯
丙炔环化反应路径发生了显着变化。即,当烯
丙炔的环二聚化进行以得到在
甲苯中的五环化合物时,仅通过在
甲醇中对烯
丙炔进行[2 + 2]环加成来独家生产双环[4.2.0] octa-1(8),5-二烯衍
生物。还证明了[2 + 2]环加成反应是由Cp * RuCl(cod)和
甲醇原位生成的阳离子
钌络合物催化的。