Preparation of (η5-C5H5)2Ti Alkyl Compounds and Reactions with Unsaturated Substrates

Reaction of Cp2TiCl with RLi (R = —CH3, —C2H5, —n-C4H9, —s-C4H9, —t-C4H9) yields the thermally instable TiIII compounds Cp2TiR. Reaction of these compounds with 2,6-xylylisocyanide, phenylisocyanate or carbon dioxide results in insertion of these ligands into the Ti—alkyl bond with formation of iminoacyl, amido and carboxylato derivatives, respectively. In the reaction with ketones a pinacol-type dimerisation is observed.