Asymmetrically substituted bis(iminophosphoranes) derived from 1,2- bis(diphenylphosphino)ethane are prepared by Michael-type addition of easily available N,P,P-trisubstituted aminophosphanes to P-vinyl iminophosphoranes. Similarly P-alkylations of aminophosphanes with P-vinyl phosphane oxides and sulfides are also disclosed.
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Alajarı́n et al. (2004) studied this question.