Titanium carbene complexes as useful tools in organic synthesis

Various titanium carbene complexes are prepared by the reductive titanation of thioacetals, gem ‐dihalides, and related organosulfur and organohalogen compounds with the titanocene(II) reagent Cp 2 Ti[P(OEt) 3 ] 2 . Alkylidene‐, heteroatom‐substituted methylidene‐, 2‐alkenylidene‐, 2‐alkynylidene‐, and vinylidene‐titanocenes thus formed are highly reactive toward organic compounds bearing a multiple bond and are employed for a variety of organic transformations such as carbonyl olefination and olefin metathesis.