“…The 31 P NMR chemical shifts and the molecular weights obtained by electron impact-mass spectrometry (EI-MS) are also included. The compounds prepared (2a-d and 3a-d) are all new species; the analogous Et 2 P(O)Ph and Et 2 P(O)OPh derivatives were, however, described earlier [5,6]. For the former compound, a d P of 48.8 [5], and for the latter, a d P of 61.0 were reported [6], which seem to match our values ( Table 1).…”