Hindered Rotation in New Air-Stable Ruthenium Olefin Metathesis Catalysts with Chromanylmethylidene Ligands
作者:Agnieszka Hryniewicka、Jacek W. Morzycki、Leszek Siergiejczyk、Stanisław Witkowski、Jacek Wójcik、Adam Gryff-Keller
DOI:10.1071/ch08443
日期:——
Three new ruthenium complexes with chromanylmethylidene ligands were synthesized and dynamic NMR analysis of these compounds was carried out. The activation energy for the C–Ru rotation was measured for the first time and found to be of ~60 kJ mol–1. The complexes may potentially serve as latent catalysts for olefinmetathesis – they promote the simple ring-closing metathesis reactions very slowly