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The cationic carbyne complex of rhenium, [π-C_5H_5(CO)_2ReCC_6H_5] BBr_4(Ⅰ), in tetrahy-drofuran reacted with 1-lithiocarborane at low temperature, with addition of the carbo-ranyl anion to earbyne earbon and carbonyl carbon atoms to give two novel carbene andcarbyne complexes of rhenium, π-cyclopentadienyl (dicarbonyl) [(1-earboranyl) (phenyl)carbene] rhenium π-C_5H_5 (CO)_2ReC (C_2HB_(10)H_(10)) C_6H_5, (Ⅱ) and π-cyclopentadienyl-(carbonyl)(1-carboranylformacyl) (phenylcarbyne) rhenium π-C_5H_5 (CO) (COC_2HB_(10)H_(10)) ReCC_6H_5 (Ⅲ).This fact indicates that there are two electrophilic centers in the cationic carbyne complexⅠ. At room temperature the complex Ⅲ in solution transformed gradually into the complexⅡ. The complexes Ⅱ and Ⅲ were identified by elemental analyses, IR, ~1H NMR and massspectra, and finally by their single crystal X-ray structure determinations. The possiblereaction mechanism is suggested and discussed in this paper.
The cationic carbyne complex of rhenium, [π-C_5H_5 (CO) _2ReCC_6H_5] BBr_4 (I), in tetrahyro-drofuran reacted with 1-lithiocarborane at low temperature, with addition of the carbo- ranyl anion to earbyne earbon and carbonyl carbon atoms to (Ⅱ) and (Ⅱ) are two novel carbene andcarbyne complexes of rhenium, π-cyclopentadienyl (dicarbonyl) (1-earboranyl) (phenyl) carbene] rhenium π-C_5H_5 (CO) _2ReC (C_2HB_ (10) H_ (10)) C_6H_5 π-cyclopentadienyl- (carbonyl) (1-carboranylformacyl) (phenylcarbyne) rhenium π-C_5H_5 (CO) (COC_2HB_ (10) H_ (10)) ReCC_6H_5 (Ⅲ) .This fact indicates that there are two electrophilic centers in the cationic carbyne complex I. At room temperature the complex III in solution transformed gradually into the complex II. The complexes II and III were identified by elemental analyzes, IR, ~ 1H NMR and mass spectra, and finally by their single crystal X-ray structure determinations. The possible reaction mechanism is suggested and discussed in this paper.