Benzylidene-Functionalized Ruthenium-Based Olefin Metathesis Catalysts for Ring-Opening Metathesis Polymerization in Organic and Aqueous Media

摘要

New catalysts (PCy3)2Cl2Ru=CH(p-C6H4)CH2-P(CH3)_3~+Cl~- (5) and(PCy3)2Cl2Ru=CH(p-C6H4)CH2-N(CH3)2 (6) as well as the literature compound (PCy3)2Cl2Ru=CH(p-C6H4)N(CH3)2 (1) have been synthesized via alkylidene exchange from Grubbs' catalyst in a one-step reaction. The catalysts promoted ROMP of the cationic exo-7-oxanorbornene derivative 11 under homogeneous conditions in various protic media including aqueous/alcoholic 1:1 mixtures, and in many cases, particularly for catalysts 5 and 6, the polymerizations proceeded in a controlled manner.