PREPARATION AND CRYSTAL STRUCTURE OF THE DICARBORANYLMAGNESIUM BIS(DIOXANE) ADDUCT Mg(2-Me-1,2-C2B10H10)2*2C4H8O2

Article abstract of DOI:10.1016/0022-328X(87)80386-8

The preparation of Mg(2-Me-1,2-C2B10H10)2*2C4H8O2 from the carboranyl Grignard reagent RMgBr (R = the methyl-ortho-carboranyl residue, 2-Me-1,2-C2B10H10) by a dioxane-induced disproportionation reaction is described.An X-ray crystallographic study of the product has revealed a monomeric molecular structure R2MgL2 (L=1,4-dioxane, C4H8O2) in which the carboranyl groups and dioxane ligands provide the central magnesium atom with a distorted tetrahedral coordination sphere of two carbon and two oxygen atoms, with bond lengths Mg-C 2.156(5) Angstroem, Mg-O 2.038(8) Angstroem and bond angles CMgC 123.5(4) deg, OMgO 99.5(5) deg, distortions from regular tetrahedral angles attributable to the relative bulk of the carboranyl ligands.