THE abstraction of carbonyl groups from organicIn examining the reaction of alcohols in the molecules by transition metals is well known, but presence of base's8 with the complexes [Ru,Cl,the accompanying production of olefin has not been
The complex [Ru,CI,( Et,PhP),] +CI-abstracts a carbonyl group from saturated aldehydes to give RuCI,(CO) (Et,PhP),.With acetaldehyde the other product is methane. With propanol and butanal the hydrocarbons formed comprise the alkane and the alkene derived from the alkyl chain : the alcohol corresponding to the aldehyde is also observed as a reaction product. This system differs from the decarbonylation of aldehydes by RhCI( Ph,P), in which, under similar conditions, the hydrocarbon formed is predominantly the alkane. The difference is further illustrated by the reactions of the ruthenium and rhodium complexes with the deuteriated aldehydes C,H&DO and CD,CH,CHO.Whereas the rhodium complex leads to C,H5D and CD,CH, respectively, supporting published evidence of an intramolecular transfer (with respect to one molecule of aldehyde) of the aldehydic hydrogen to the alkyl group, the ruthenium system gives rise to a variety of deuteriated hydrocarbons showing labilisation of both a-and P-hydrogen atoms. No evidence for free-radical participation has been obtained for the ruthenium system, for which possible reaction mechanisms are discussed : participation of a 3 ~ketyl system provides an attractive rationalisation of the exchange observations.WE have previously reported the decarbonylation of several papers have been published 3-9 on the decarbonylsaturated aldehydes by the known complex ation of aldehydes by RhC1(Ph3P)3.10~6 This paper [Ru2C13(Et2PhP),]+C1-. During the course of our work describes the extension of the work on the ruthenium
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