引用本文:
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
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
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
1H NMR analysis of the tolylene-2,4-diisocyanate-methanol reaction
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-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).
English
1H NMR analysis of the tolylene-2,4-diisocyanate-methanol reaction
Abstract:
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).
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Key words:
- Tolylene-2,4-diisocyanate
- / Polyurethane reaction
- / Kinetics
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