Abstract
The reduction of coordinated CO on Cp 2Fe 2(CO) 4 by LiAlH 4 has been investigated with isotopic labeling in an attempt to delineate the chain formation step. Reduction with LiAlD 4 resulted in formation of perdeutero-hydrocarbons. Reduction under an atmosphere of 13CO resulted in substantial incorporation of 13C into the hydrocarbon products. Reaction of the complexes RFeCp(CO) 2, R CH 3, C 2H 5 and CH 3C(O), with LAD and with LAH under 13CO are reported. Reaction of CH 3 13C(O)FeCp(CO) 2 with LAH is also reported. The results of these reactions suggest that chain extension occurs by a CO insertion reaction, probably by CO insertion into an alkylidenemetal bond.
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