~1H NMR analysis of the tolylene-2,4-diisocyanate-methanol reaction

作     者：Peng Fei Yang Yong De Han Tian Duo Li Jun Ying Li 

作者机构：Key Laboratory of Fine Chemicals(Shandong Province)Shandong Institute of Light IndustryJinan 250353China Science and Technology OfficeShandong Institute of Light IndustryJinan 250353China School of Chemical EngineeringShandong Institute of Light IndustryJinan 250353China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2010年第21卷第7期

页      面：853-855页

核心收录：

学科分类：1007[医学-药学(可授医学、理学学位)] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 10[医学] 

基　　金：the financial support from the National Natural Science Foundation of China(No. 20676074) the National Natural Science Foundation of Shandong Province(No.Y2004B04) 

主　　题：Tolylene-2 4-diisocyanate Polyurethane reaction Kinetics 

摘      要：Tolylene-2,4-diisocyanate（2,4-TDI） 1 reacts with methanol through two simultaneous paths in the polyurethane reaction,which involve two different intermediates-tolylene-4-carbamatic-2-isocyanate 2 and tolylene-2-carbamatic-4-isocyanate 3,and the final product is tolylene-2,4-dicarbamate ***-CH_3 chemical shifts in benzene ring in compounds 1,2,3 and 4 can be easily tested and well distinguished,through which those four compounds are quantified and their kinetics are *** shows that four rate constants for the tolylene-2,4-diisocyanate-methanol reaction in CCl_4 at 50℃are k_1=9.6×10^（-2）h^（-2）mol^（-2）min^（-1）, k_2=1.4×10^（-2）h^（-2）mol^（-2）min^（-1）,k_3=4.0×10^（-3）h^（-2）mol^（-2）min^（-1）,k_4=1.4×10^（-3）h^（-2）mol^（-2）min^（-1）.（k_1 is the reaction rate constant from compounds 1 to 2;k_2 is the reaction rate constant from compounds 1 to 3;k_3 is the reaction rate constant from compounds 3 to 4;k_4 is the reaction rate constant from compounds 2 to 4）.