Grubbs first- and second-generation catalyst. The remarkable selectivity increase at higher concentration for differentiating between two alkene moieties in nearly identical steric and stereoelectronic environments is believed to be the result of a higher ring-closure rate for smaller-sized ring formation under rapid pre-equilibration of the two alkylidene species generated from either alkene moiety.
使用 Grubbs 第一代和第二代催化剂实现了炔基甲
硅烷氧基系链二炔的高基团选择性闭环复分解反应。在几乎相同的空间和立体电子环境中,在较高浓度下区分两个烯烃部分的显着选择性增加被认为是在生成的两种亚烷基物质快速预平衡下形成较小尺寸环的闭环率较高的结果来自任一烯烃部分。