KINETICS OF THE SYNTHESIS OF TETRAETHYLETHYLENEDIPHOSPHONATE THROUGH NMR-STUDY

The synthesis of tetraethylethylenediphosphonate (TEEDP) was investiga ted by means of H-1-NMR technique. The alkylenation process occurs via two steps. Some aspects of the reaction kinetics were discussed. The second step is ca. 1.7 times slower than the first one. TEEDP was synt hesized via the intermediate formation of bromoethyl-diethylphosphonat e. The first step is a ist order reaction with respect to each reagent . Small TEEDP amounts were yielded in the first step suggesting the fu rther reaction of the intermediate product with triethylphosphite. For both steps, the formation of the phosphonium ions (I and II) occurs m ore quickly than their decompositions.