Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Methylidenephosphine was formed by gas-phase or liquid-phase HCl-elimination from chloromethylphosphine and unambiguously characterized by chemical trapping and spectroscopic analysis (MS,-IR, 31 P NMR). ... Methylidenephosphine was formed by gas-phase or liquid-phase HCl- ...