Citation: Peng Fei Yang, Yong De Han, Tian Duo Li, Jun Ying Li. ¹H NMR analysis of the tolylene-2,4-diisocyanate-methanol reaction[J]. Chinese Chemical Letters, ;2010, 21(7): 853-855. doi: 10.1016/j.cclet.2010.02.017 shu

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

a Key Laboratory of Fine Chemicals (Shandong Province), Shandong Institute of Light Industry, Jinan 250353, China;
b Science and Technology Office, Shandong Institute of Light Industry, Jinan 250353, China;
c School of Chemical Engineering, Shandong Institute of Light Industry, Jinan 250353, China

Received Date: 3 November 2009

Fund Project: The authors are grateful to the financial support from the National Natural Science Foundation of China (No. 20676074) and the National Natural Science Foundation of Shandong Province (No. Y2004B04).

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-caxbamatic-2-isocyanate 2 and tolylene-2-carbamatic-4-isocyanate 3,and the final product is tolylene-2,4-dicarbamate 4.The-CH₃ 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 investigated.It shows that four rate constants for the tolylene-2,4-diisocyanate-methanol reaction in CCl₄ at 50℃ are k₁=9.6×10^-2h^-2mol^-2min^-1,k₂=1.4×10^-2h^-2mol^-2min^-l,k₃=4.0×10^-3h^-2mol^-2min^-1,k₄=1.4×10^-3h^-2mol^-2min^-1.(k₁ is the reaction rate constant from compounds 1 to 2; k₂ is the reaction rate constant from compounds 1 to 3; k₃ is the reaction rate constant from compounds 3 to 4; k₄ is the reaction rate constant from compounds 2 to 4).
- Tolylene-2,4-diisocyanate,
- Polyurethane reaction,
- Kinetics
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