SaIts of vinylphosphonic acid and derivatives of the type CH,-CHP (0)(X) OCH2C€ 12CI where X= C1, N (CHJ)~ and OCHI have been prepared starting from the commercially available bis (2-chloroethyl) vinylphosphonate. Diethyl 1 (and 2)-propynylphosphonate has been prepared from propargyl bromide and diethyl phosphonate. The molar refractions and infrared absorption spectra of several of these materials have been determined, and the ...