Steric Effects in Heteroboranes. V. 1-Ph-2-Me3Si-1,2-closo-C2B10H10
                                
                                    
                                        作者:T. D. McGrath、A. J. Welch                                    
                                    
                                        DOI:10.1107/s010827019400908x
                                    
                                    
                                        日期:1995.4.15
                                    
                                    The structure of 1-phenyl-2-trimethylsilyl-1,2-dicarba-closo-dodecaborane(12), C11H24B10Si, has been determined crystallographically. The C-cage-C-cage distance is 1.708 (4) Angstrom, only slightly longer than in the 2-methyl analogue. However, in contrast to the 2-methyl and 2-bromo analogues, relief from steric congestion is afforded by a mutual 'bend back' of both the phenyl and trimethylsilyl groups, the latter involving deformation of valency angles both at Si and the C-cage atom to which it is attached.