Abstract
The reaction of PhCCPh with cyclomanganated compounds derived from substituted phenylimidazoles gave the seven-membered metallacycles [Mn{2-(CPhCPh)C 6H 4CNCHCHN(Me)}(CO) 4] ( 1) and [Mn{2-(CPhCPh)C 6H 4CNCHN(Me)C(Ph)}(CO) 4] ( 2), with insertion of the alkyne into the MnC bond. When an unsymmetrical alkyne such as MeCCPh was used, the reaction was not regiospecific and two different isomers were obtained, which could be separated by fractional crystallization, e.g. [Mn{2-(CMeCPh)C 6H 4CNCHN(Me)C(Ph)}(CO) 4] ( 5) and [Mn{2-(CPhCMe)C 6H 4CNCHN(Me)C(Ph)}(CO) 4] ( 6). The compounds were characterized by analytical and spectroscopic techniques, and in the case of 5, by X-ray crystallography.
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