Spaltung aromatischer und vinylischer C-H-Bindungen durch Cyclopentadienylruthenium(II)-Komplexe

Article abstract of DOI:10.1016/S0022-328X(00)99061-2

Neopentylruthenium complexes of the type Cp(Me_nPh_3-nP)2RuCH2CMe3 (Cp = C5H5, C5Me5; n = 0-3) react with aromatic C-H bonds in benzene or toluene to give the corresponding phenyl- or tolyl-ruthenium compounds and neopentane.With toluene, a mixture of the m- and p-tolyl complexes is formed.The reactivity of the neopentylruthenium compounds decreases with increasing degree of methyl substitution at the phosphorus atom, and with bidentate phosphane ligands.A permethylated Cp group increases the reactivity. (C5Me5)(Me3P)2RuCH2CMe3 reacts also with the vinylic C-H bond of ethylene to form an (η²-ethylene)vinylruthenium complex.