Reaction of Cp2ZrMe2 with CpMo(CO)3H yields methane and Cp2ZrMeMo(CO)3Cp (1), which has two terminal carbonyl ligands and a third carbonyl with a low (1545 cm"1) stretching frequency. Added gaseous CO inserts into the Zr-Me bond in 1 to form the n2-acetyl ligand in 2, Cp2Zr[C(0)Me](OC)Mo(CO)2Cp, which is shown by X-ray crystallography to lack a Zr-Mo bond but to be held together by a carbonyl-OC bridge. Complex 2, which is also formed from Cp2Zr[C(0)Me]Me and CpMo(CO)3H, reacts rapidly with proton sources to form CpMo(CO)3H and CH3CHO. Complex 2 slowly loses CO in solution to form Cp2Zr(OCMe)(OC)MoCOCp (3), which contains a Zr-Mo bond, a bridging oxycarbene/acetyl, and a four-electron-donor carbonyl.
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