反应详情

169 g of a polyurea mixture based on 2,4-diaminotoluene containing terminal aminotolyl groups (average molecular weight, 1500) were introduced into the apparatus described in Example 1. 428 g of 2,4-diaminotoluene, 384 g of urea, 168 g of ethyl carbamate, 1700 g of ethanol (approximately 96%) and 5.2 g of zinc octoate were then added. The mixture was reacted for 6.0 hours at 200° C. in the same way as in Example 1. After cooling and venting of the apparatus, the reaction mixture was removed, filtered and analyzed by high pressure liquid chromatography. A yield of 937 g (75% of the theoretical yield) of 2,4-bis-(ethoxy carbonyl amino)-toluene was determined.

1. additionwere introduced into the apparatus
2. customThe mixture was reacted for 6.0 hours at 200° C. in the same way as in Example 1
3. temperatureAfter cooling
4. customthe reaction mixture was removed
5. filtrationfiltered