TRI-1-METHALLYL- AND 1-METHALLYL-BUTADIENE GROUP IV TRANSITION METAL COMPLEXES

Article abstract of DOI:10.1016/S0022-328X(00)81011-6

Reaction of Cp'MCl3 (Cp' = η⁵-C5(CH3)5; M = Ti, Zr, Hf) with 2-butenylmagnesium bromide at low temperatures gives Cp'M(1-methallyl)3, which is readily converted into Cp'M(η³-1-methallyl)(η⁴-butadiene) on heating.Only Cp'Hf(1-methallyl)3 could be isolated; it is fluxional and its NMR and IR spectra indicate that it consists of a complex mixture of isomers containing interconverting η¹- and η³-1-methallyl groups.The compounds Cp'M(η³-C4H7)(η⁴-C4H6) are much more thermally stable; they show fluxional behaviour, but this is limited to theη³-1-methallyl group.These complexes are very reactive towards a large variety of organic substrates.