A solution of blue Mo(CO)2(PEt3)2Br2 was treated with a tenfold excess of 2-butyne to give X , a dark green product. X had bands in the 1H NMR at d 0.90 (relative area = 3), 1.63 (2), and 3.16 (1). The peak at 3.16 was a singlet at room temperature but split into two peaks at temperatures below –20 °C. 31P NMR showed only a single resonance. IR showed a single strong band at 1950 cm-1. Molecular weight determinations suggest that X has a molecular weight of 580± 15. Suggest a structure for X , and account for as much of the data as possible. (See P. B. Winston, S. J. Nieter Burgmayer, J. L. Templeton, Organometallics , 1983 , 2 , 168.)
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