Abstract
The synthesis of unprecedented alkyne hydrotris(3,5-dimethylpyrazolyl)borato (TpMe2) tantalum(III) complexes is reported. The parent dichloro complex TpMe2TaCl2(PhC≡ CCH3) (2) is obtained from TaCl3(DME)(PhC≡CCH3) and KTpMe2. 2 reacts with methyllithium to give the dimethyl complex TpMe2Ta(CH3)2(PhC≡CCH3) (3) and with ethylmagnesium chloride to give the X-ray characterized α-agostic ethyl complex TpMe2Ta(Cl)(μ-H–CHCH3)(PhC≡CCH3) (4). Reaction of 4 with methyllithium generates the mixed methyl ethyl complex TpMe2Ta(CH3)(μ-H–CHCH3)(PhC≡CCH3) (5) in solution. Spectroscopic data indicate that 5 is α-agostic at the ethyl group only.
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