We have long been interested in developing new, practicable organometallic methodology for generalized olefin synthesis. We have noted'that CpzZr (PR3), reacts with simple phosphoranes (although slowly and in low yield) to give Cp, Zr-alkylidenes; a variety of these (best made by an alternate route) condense with carbonyl-groupcontaining materials to give olefins in high yield., We have also found that simple phosphoranes and CpzMo ( ...