With dibutyl tin dilaurate as catalyst* blocking reactions of hexamethyllene diiso-cyanate(HDI)with succinimide, ethyl 4-hydroxybenzoate and ethyl 1-hydroxybenzoate were studied in this paper.

• 以二丁基锡二月桂酸为催化剂,研究了丁二酰亚胺、水杨酸乙酯、对羟基苯甲酸乙酯与六亚甲基二异氰酸酯之间的封闭反应。