Abstract
Three binuclear metal alkyl complexes were synthesised, viz. [Cp(CO) 2Fe{CH(CH 3)CH 2CH 2}Fe(CO) 2Cp] ( I), [CpFe(CO) 2{CH(CH 3)CH 2CH 2CH 2}Fe(CO) 2Cp] ( II) and [CpMo(CO) 3{CH(CH 3)CH 2CH 2}Mo(CO) 3Cp] ( III) (Cp=η 5-cyclopentadienyl). These compounds were then reacted with PPh 3 in order to induce alkyl migration (CO insertion) reactions. The products obtained were monosubstituted phosphine acyl species. In all cases, the branched chain alkyl fragment (viz. MCH(CH 3)) was observed to react preferentially over the linear fragment (viz. MCH 2CH 2). These results are rationalised in terms of the relative importance of steric and electronic effects in alkyl migration reactions.
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