“…Compound C 6 H 5 C(O)NHP(O)[NH-C(CH 3 ) 3 ] 2 showed two conformers in solution NMR spectra and solid state [14]. Moreover, compounds C 6 H 5 C(O)NHP(O)X 2 , X = NC 3 H 6 [15], NC 4 H 8 [16] 4-CH 3 -C 6 H 4 OP(O)(NH-CH (CH 3 )(CH 2 C 6 H 5 ) [17] and C 6 H 5 C(O)NHP(O)(NC 5 H 10 ) 2 [18] 4-F-C 6 H 4 C(O)NH P(O)(NC 5 H 10 ) 2 [19] exhibited two and four conformers, respectively, only in their crystalline states. The synthesis and structure of compound {(1R, 2S)-N-i Pr-ephedrine}P(S)NH[(Si(CH 3 ) 3 ], which is an oxazaphosphole molecule with three independent molecules in the crystalline lattice, was reported [20].…”