α-substituierte Phosphonate. 56. Synthese und Reaktionen von 1-Formylamino-2,2,2-trichlorethanphosphonaten

α-substituted Phosphonates. 56. Synthesis and Reactions of 1-Formylamino-2,2,2-trichloroethanephosphonates The chemical behaviour of formylamino phosphonates 2 , prepared from 1,2,2,2-tetrachloroethylformamid and trialkylphosphites, was investigated. The phosphonate 2b was cleaved under acidic conditions to aminosubstituted phosphonate 3 . The phosphonates 2 and 3 react with bases to 2,2-dichlorovinylphosphonates 8 and 6 , respectively. Oxazoles 9 are formed by treatment of the phosphonate 2 and 8 , respectively, with prim. or sec. amines.