A drastic increase in catalyst turnover number (TON) was accomplished in the cross-metathesis of tetrafluoroethylene (TFE) and vinyl ethers. Under a continuous flow of TFE, catalyst Ru7, which contains a seven-membered N-heterocyclic carbene (NHC) ligand, reached a TON of 4100; this is 2 orders of magnitude higher than the highest hitherto reported value. Mechanistic studies revealed that the expanded
在
四氟乙烯 (
TFE) 和
乙烯基醚的交叉复分解中实现了催化剂周转数 (TON) 的急剧增加。在
TFE 的连续流动下,含有七元 N-杂环卡宾 (NHC)
配体的催化剂Ru7的 TON 达到 4100;这比迄今为止报告的最高值高出 2 个数量级。机理研究表明,扩展的 NHC 成功地破坏了具有
二氟卡宾结构的稳定中间体,从而强烈促进了反应。