Reactions and Coordination Properties of the First Secondary Carbaboranyldiphosphane: 1,2-Bis(phenylphosphanyl)-1,2-dicarba-closo-dodecaborane(12) (original) (raw)

1998, European Journal of Inorganic Chemistry

When a mixture of stereoisomers of rac-and meso-1,2bis(phenylphosphanyl)-1,2-dicarba-closo-dodecaborane(12) (1a, b; 1a/1b = 3:1) is treated with [Cp 2 ZrMe 2 ] in boiling toluene for 2 h, the formation of three phosphorus-containing products, namely meso-[Cp 2 Zr(PPh) 3 ] (3), (PPh) 4 (4) and (PPh) 5 (5), ratio 2.8:1.1:1.0, was observed by 31 P-NMR spectroscopy. In the 11 B-NMR spectrum of the reaction mixture, only signals for 1,2dicarba-closo-dodecaborane(12) were observed. When zirconocene, prepared in situ from [Cp 2 ZrCl 2 ] and BuLi, was treated with 1a, b at low temperature and then heated to reflux in toluene for 2 h, only formation of 3 and 1,2-dicarba-closo-dodecaborane(12) was observed. The mixture of stereoisomers of 1a, b reacts with CuCl in THF to give rac-and meso-[CuCl(THF){1,2