分析测试学报2009，Vol.28Issue(7)：849-854,6.DOI:10.3969/j.issn.1004-4957.2009.07.020
NMR对MDI在稀溶液中水解反应机理的表征
Characterization of Hydrolyzing of Diphenylmethane Diisocyanate in Dilute Solution by NMR
陈冬梅 1张玉冰2
作者信息
- 1. 青岛科技大学,新材料重点实验室,山东,青岛,266042
- 2. 青岛市新材料科技工业园发展有限公司,山东,青岛,266111
- 折叠
摘要
Abstract
The mechanism of the hydrolysis reaction of diphenylmethane diisocyanate(MDI) in dilute solution was studied by NMR.MDI was dissolved in CDCl3,(CD3)2CO and deuterated diphenyl sulfoxide(DMSO) containing a small quantity of water,respectively,and then were analyzed by 1H NMR and 13C NMR,respectively.The results indicated that the NMR spectrum of MDI in water-containing DMSO solvent was quite different from those in CDCl3 and (CD3)2CO solvents.MDI in DMSO solvent was further studied by 13C-1H heteronuclear multiple-quantum coherence(HMQC),13C-1H heteronuclear multiple-bond correlation(HMBC) and distortionless enhancement by polarization transfer(DEPT 135),respectively,and its corresponding spectra were assigned with the aid of empirical formula.The structures of the products were also confirmed.It was found that MDI reacted rapidly with the water in DMSO,and the isocyanate group transformed into para-/ortho-substituted urea group and para-/ortho-substituted amino group.The reactivity of water with amino group produced from the reaction of isocyanate with water was higher than that of water with isocyanate.The reactivities of water with para-and ortho-substituted amino group were 7.1 and 1.4,respectively.Hence,the effect of water content should be taken into consideration when water-containing DMSO is used as solvent for NMR analysis.关键词
核磁共振波谱(NMR)/表征/水解/二苯基甲烷二异氰酸酯(MDI)Key words
NMR/characterization/hydrolysis/diphenylmethane diisocyanate(MDI)分类
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陈冬梅,张玉冰..NMR对MDI在稀溶液中水解反应机理的表征[J].分析测试学报,2009,28(7):849-854,6.
