New catalytic route to silylene–vinylene–boronate systems
摘要:
Cross-coupling of divinylorganosilicon compounds with vinylboranes in the presence of complexes containing Ru-H bonds (preferably [Ru(CO)ClH(PCy3)(2)]) leads to formation of borylfunctionalized dienes, which can be potentially used as monomers for polymerization reactions or reagents in Pd-catalyzed coupling. The influence of the catalyst, temperature, time and molar ratio of substrates and Ru-complex on the yields and selectivities of the obtained products were tested. (C) 2010 Elsevier B. V. All rights reserved.
A new efficient route for selective synthesis of various, novel alkynyl(vinyl)substituted silicon (6) and alkynyl[(E)-alkenyl]substituted silicon compounds (9) via silylative coupling of alkynes and their products catalyzed by ruthenium(+2) complexes is described. The tandem procedure facilitates the formation of 9 synthesized in a high yield and stereoselectivity by a sequential silylative coupling