Formation of RuII-alkyl-butadiene complexes from dihalogeno-RuIV-allyl precursors by the reaction with BrMg(CH2)4MgBr: a novel decomposition pathway for ruthena(IV)cyclopentane intermediates

Article abstract of DOI:10.1016/0022-328X(91)83186-8

Treatment of (C5Me5)RuBr2(η³-CH2C(R)CH2) with BrMg(CH2)4MgBr in ether afforded the Ru^II-alkyl-butadiene complexes, (C5Me5)Ru(η⁴-C4H6)(η¹-Ch2CHRCH3) .Labeling experiments have revealed a mechanism involving a double β-hydrogen elimination from ruthenacyclopentane intermediates and subsequent stepwise transfer of the hydrogen atoms to hydrogenate the η³-allyl ligand.