反应详情

Following the procedure of Example 1 (Stage 3), 140 g (0.62 mol) 2-aminoethyl-2-(3-aminopropyl)5- (or 6) -aminoethyl-bicyclo-[2,2,1]-heptane in 1.5 liters of boiling chlorobenzene are initially converted with CO2 into the carbamic acid derivative which is thereafter phosgenated, first in the cold and then at boiling temperature. The 2-isocyanatomethyl-2-(3-isocyanatopropyl)-5- (or 6) -isocyanato ethyl-bicyclo-[2,2,1]-heptane is obtained from the clear reaction solution in the form of a pale yellow liquid by distillation at a boiling point of 186°-188° C./ 0.1 Torr. Yield 170 g (90%). Viscosity 80 cP/20° C.