Methylene-bridged Group 13-15 compounds, R2MCH2PPh2 (R = CH2CMe3, CH2SiMe3; M = Ga,In). Crystal structure of [(Me3CCH2)2InCH2PPh2]2.cntdot.C6D6, a molecule containing an In-C-P-In-C-P ring in a chair conformation

Abstract

Abstract : A series of compounds of the type R2MCH2PPh2 (R = CH2CMe3, CH2SiMe3; M = Ga, In) have been prepared by metathetical reactions between the appropriate diorganometal halide and LiCH2PPH2 in pentane or Et2O at -78 C. All compounds were characterized by physical properties, partial elemental analyses (C, H), cryoscopic molecular weight measurements in benzene solution as well as IR, H NMR and P NMR spectroscopic data. All appropriate data support the existence of dimeric molecules. The monomeric species dimerize by apparent Lewis acid-base interactions. These interactions are sufficiently strong that the compounds do not form stable adducts with oxygen- or nitrogen-containing Lewis bases.