APPLICATION OF 1,2-BIS(2-BROMO-3,5-DI-T-BUTYLPHENYL)ETHANE TO PREPARATION OF COMPOUNDS HAVING 2 DIPHOSPHENE UNITS

A sterically crowded bromobenzene, 1,2-bis(2-bromo-3,5-di-t-butylpheny l)ethane, was prepared and converted to the corresponding phosphonous dichloride, which reacted with lithium (2,4,6-tri-1-butylphenyl)phosph ide to give -butylphenyl)phosphinidenephosphino}phenyl]ethane; the pho tolysis of the compound gave E-bis(2,4,6-tri-t-butylphenyl)diphosphene and an internal Z-diphosphene; the tungsten complex of the latter was analyzed by X-ray crystallography. Copyright (C) 1996 Elsevier Scienc e Ltd