反应详情

275 g of a polyurea mixture based on 2,4-diamino-toluene having terminal amino tolyl groups (average molecular weight: 1500) were introduced into the apparatus described in Example 1. 513 g of 2,4-diamino-toluene, 933 g ethyl carbamate and 1250 g ethanol (approximately 96%) were subsequently added. The mixture was reacted for 6.0 hours at 200° C. After the apparatus had cooled and the pressure had been reduced, the reaction mixture was removed, filtered and analyzed by high pressure liquid chromatography (HPLC). A yield of 1100 g (68% of the theoretical yield) of 2,4-bis-(ethoxy carbonylamino)-toluene was obtained.

1. additionwere introduced into the apparatus
2. customThe mixture was reacted for 6.0 hours at 200° C
3. temperatureAfter the apparatus had cooled
4. customthe reaction mixture was removed
5. filtrationfiltered