Carbon Dioxide → HCID 13691091, compound

Participants

Reaction Conditions

Reaction Steps

621 g of phosgene are condensed in 2.3 l of chlorobenzene at about 0° C. 353 g of 1,2-bis(3-aminophenyl)-1,1,2,2-tetrafluoroethane, dissolved in 1.2 l of chlorobenzene, are slowly added at a temperature of -10° C. to +10° C. The batch is heated up to 120° C. in the course of four hours. Further gaseous phosgene is passed in from about 80° C. The solution becomes clear at 100° to 110° C. Phosgene is passed through the solution at 120° C. for a further 90 minutes. The phosgene still dissolved is then blown out with CO2 and the mixture is subsequently worked up by distillation. 355 g of 1,2-bis-(3-isocyanatophenyl)-1,1,2,2-tetrafluoroethane, boiling point: 145° to 150° C./0.1 mbar, melting point: 139° to 140° C. (purity, according to gas chromatography, 97%) are obtained.

Provenance & Evidence