Heterocycles as ligands. 21 1. Stable titanium carbene complexes.
The Ti carbene complexes I (R = Me, Et, CHMe2) are obtained by the reaction of the imidazol-2-ylidenes with TiCl4 in good yields. Careful hydrolysis of I (R = CHMe2) gives the dinuclear complex II (R = CHMe2) which was characterized by x-ray crystallog. and in which two complex fragments of pentacoordinated Ti are connected by a near linear O bridge.
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