Citation: WANG Xiao-Xuan, HU Wei, GUI Da-Yong, CHI Xu-Hui, WANG Ming-Liang, TIAN De-Yu, LIU Jian-Hong, MA Xin-Gang, PANG Ai-Min. Proton Transfer in Reaction between 2,4-Diisocyanatotoluene and Amine Compounds[J]. Acta Physico-Chimica Sinica, 2014, 30(1): 34-42. doi: 10.3866/PKU.WHXB201311121
甲苯-2,4-二异氰酸酯与仲胺类化合物反应中的质子转移过程
采用密度泛函理论B3LYP/6-31+G(d,p)方法研究了甲苯-2,4-二异氰酸酯(2,4-TDI)与仲胺类化合物反应过程中的质子转移效应. 研究发现甲醇分子对反应有显著的催化效应,可使反应能垒大幅降低,这表明含活泼氢的化合物会加速质子转移过程,从而加快反应速率. 2,4-TDI与甲基-N-甲基氨基甲酸酯的催化加成反应为一步反应,其反应过渡态呈六元环结构;而2,4-TDI与N-甲基对硝基苯胺、二苯胺、1,2-二氢-2,2,4-三甲基喹啉等芳香胺类化合物的催化加成反应经历了两步反应,其中第一步为速率控制步骤. 研究表明,在与2,4-TDI的反应中,芳胺化合物的活性高于甲基-N-甲基氨基甲酸酯的活性,计算的反应活性顺序与实验结果一致.
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关键词:
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密度泛函理论
- / 质子转移
- / 甲苯-2,4-二异氰酸酯
- / 聚氨酯反应
English
Proton Transfer in Reaction between 2,4-Diisocyanatotoluene and Amine Compounds
The effects of proton transfer on the reaction between 2,4-diisocyanatotoluene (2,4-TDI) and active-hydrogen-containing amine compounds were calculated using density functional theory (DFT) at the B3LYP/6-31+G(d, p) level. The energy barriers are significantly reduced when a methanol molecule serves as a proton transporter or a reactive catalyst, indicating that the labile hydrogen-containing compound plays a key role in accelerating the reaction rate and proton transfer. The catalytic addition of 2,4-TDI and methyl N-methylcarbamate follows a one-step mechanism, with a transition state characterized by a sixmembered ring. However, the catalytic additions of 2,4-TDI and aromatic amines such as N-methyl-p-nitroaniline, diphenylamine, and 1,2-dihydro-2,2,4-trimethylquinoline involve two steps, with the first step as the rate-limiting step. The reactions between 2,4-TDI and aromatic amines have lower energy barriers than that between 2,4-TDI and methyl N-methylcarbamate. The aromatic amines are more active than methyl N-methylcarbamate in the reaction with 2,4-TDI, which is in a od agreement with experimental results.
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