Ortho- and Para-Substituted Hoveyda−Grubbs Carbenes. An Improved Synthesis of Highly Efficient Metathesis Initiators
摘要:
A novel highly efficient and general route to various 3- and 5-substituted 2-alkoxystyrenes, required for the preparation of Hoveyda-Grubbs catalysts, is described.
Fast-Initiating, Ruthenium-based Catalysts for Improved Activity in Highly <i>E</i>-Selective Cross Metathesis
作者:Tonia S. Ahmed、Robert H. Grubbs
DOI:10.1021/jacs.6b11330
日期:2017.2.1
Ruthenium-based olefinmetathesis catalysts bearing dithiolate ligands have been recently employed to generate olefins with high E-selectivity (>99% E) but have been limited by low to moderate yields. In this report, 1H NMR studies reveal that a major contributingfactor to this low activity is the extremely low initiation rates of these catalysts with trans olefins. Introducing a 2-isopropoxy-3-phenylbenzylidene