182575-00-4Relevant academic research and scientific papers
Arylmagnesium to arylcopper conversion monitored by solid state characterization of halide intermediates. Synthesis of homoleptic (o-vinylphenyl)copper
Eriksson, Henrik,?rtendahl, Mikael,H?kansson, Mikael
, p. 4823 - 4831 (1996)
The reaction between Mg(viph)2 (viph = o-vinylphenyl) and copper(I) chloride has been found to be the best way of preparing the homoleptic tetramer [Cu4(viph)4]. The MgR2 reagent crystallizes as monomeric [Mg(THF)2(viph)2] from a THF solution. In the reaction between the Grignard reagent (viph)MgBr and copper(I) chloride, two unstable mixed halide/ aryl intermediates, [Mg(THF)6][Cu5(viph)2Br4] 2·THF (3) and [Mg(THF)5Cl][Cu5(viph)4Br 2]·-THF (4), were isolated and found to reduce the yield of [Cu4(viph)4] markedly. The crystal structures of 3 and 4 were determined and were found to exhibit unusual coordination geometries for copper(I) and provide mechanistic information. Compound 3 was found to react with excess triphenylphosphine in THF, yielding [Cu(PPh3)3Br]·THF. It is suggested that [Cu4(viph)4], which is not π-coordinated in the solid state or in THF solution, may have important precursor qualities for the preparation of new organocopper compounds.
