Abstract: 1-Cyano-1-isocyanoalkylphosphonic acid esters 4 were synthesized starting from cyanoalkyl-phosphonic acid esters 1 by amination and formylation followed by dehydration with trichloromethylchloroformate (diphosgene) and triethylamine at low temperatures. Bromination of 4 gave 1, 1-(dibromomethylideneamino)-1-cyanophosphonic acid esters 5. Key words: 1-cyano-1-isocyanoalkylphosphonic acid esters, 1, 1-( ...
