Abstract Addition of secondary amines to diethyl alkynephosphonates, catalyzed by Cu (I) salts, proceeds regio-and stereospecifically and yields diethyl (E)-2- diethylaminooalkenephosphonates. The E configuration was established by analysis of the vicinal coupling constants between the phosphorus and carbon nuclei in the 13 C NMR spectra of the reaction products and model compounds: 3 JPC is 6-10 Hz at the cis ...
