Direct formation of fischer-type carbene complexes from W(CO)6 and alkynes

Abstract

Co-ordinatively unsaturated tungstacarbonyl species, formed either chemically or photochemically, react with alkynes H–CC–R to give, after solvolysis of presumed vinylidene complexes by R'OH, in the presence of SiO2, the fischer-type carbene complexes (CO)5WC(OR′)(CH2R).