Nickel–heterocumulene complexes stabilized by trimethylphosphine: Synthesis, characterization and catalytic application in organozinc coupling with CS2
作者:Ning Huang、Xiaoyan Li、Wengang Xu、Hongjian Sun
DOI:10.1016/j.ica.2012.09.002
日期:2013.1
The reactivity of Ni(PMe3)(4) with CO2, CS2 and SCNPh was studied. Although CO2 is structurally homologous compound with CS2 and SCNPh, its reactivity with Ni(PMe3)(4) shows a different result with those of CS2 and SCNPh. Reactions of Ni(PMe3)(4) with carbon disulfide and phenyl isothiocyanate in THF give the tetrahedral coordinate complexes (Me3P)(3)Ni(eta(2)-CS2) (1) and (Me3P)(3)Ni(eta(2)-SCNPh) (3), characterized by standard spectroscopic methods and X-ray diffraction. Nickel(0) complexes 1 and 3 are stabilized by the strong donor ligand PMe3. In the case of CO2, attempts to isolate the expected nickel(0) complex (Me3P)(3)Ni(eta(2)-CO2) (4) proved to be unsuccessful. To further extend the utility of our nickel catalysts, the catalytic coupling of organozinc bearing different functionalities with CS2 was explored. With 10 mol% of 1 as the catalyst, MeZnMe, EtZnEt and PhZnBr coupled with CS2 to form the corresponding methyl dithiocarboxylate following esterfication of the initial products. (C) 2012 Elsevier B.V. All rights reserved.