“…The digital resolutions were 0.25 Hz, 0.5 Hz and 1.25 Hz for 1 H-, 13 C-and 31 P NMR spectra respectively. 3a,b: Compounds 3a,b can be obtained with a 35Ϫ40% yield (after distillation) from methylene-bis(dichlorophosphane) [17] and dialkylamine. Use of silylated dialkylamine increases the yield to 50%.…”