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 organnhalogen compounds with the titanocene(II) reagent Cp2Ti[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. (c) 2007 The Japan Chemical Journal Forum and Wiley Periodicals, Inc.