A new trisphosphoranylphosphine oxide 1 bearing three sigma(5)lambda(5)P-si
gma(4)lambda(5)P bonds was synthesized through an efficient method in which
N,N-dialkylphenylacetamide played an important role. Chloroform reduced th
e phosphine oxide 1 to the corresponding phosphine 2. The crystal structure
of 2 was determined.