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

Abstract

Zusammenfassung Neopentylruthenium complexes of the type Cp(Me n Ph 3- n P) 2 RuCH 2 CMe 3 (Cp  C 5 H 5 , C 5 Me 5 ; 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. (C 5 Me 5 )(Me 3 P) 2 RuCH 2 CMe 3 reacts also with the vinylic CH bond of ethylene to form an (η 2 -ethylene)vinylruthenium complex.