Synthesis, Reactivity, Electrochemical Study, and Crystal Structures of (η5:η5-(C5H3CO2Me)2)Mo2(CO)6

The reaction of a dicarbomethoxydihydrofulvalene solution with Mo(CO)6 leads to the formation of two isomers of (η5:η5-(C5H3CO2Me)2)Mo2(CO)6 (1 and 2). The X-ray structure of both compounds has been determined. Reaction of 2 with LiEt3BH yields Li2[(η5:η5-(C5H3CO2Me)2)Mo2(CO)6] (3), and this with Hg(CN)2 results in the insertion of Hg into the Mo−Mo bond giving (η5:η5-(C5H3CO2Me)2)Mo2(CO)6Hg (4). The electrochemical study of 1−4 is reported. …