催化作用
化学
双功能
异氰酸酯
结合
有机碱
醋酸
组合化学
高分子化学
有机化学
基础(拓扑)
数学
数学分析
聚氨酯
作者
Li Wu,Wei Liu,Jinxing Ye,Ruihua Cheng
标识
DOI:10.1016/j.catcom.2020.106097
摘要
An array of organic bases DMAP (4-dimethylaminopyridine), DBU (1, 8-diazabicyclo [5.4.0] undec-7-ene), TBD (1, 5, 7-triazabicyclo [4.4.0] dec-5-ene), and their base/acid conjugate organocatalyst systems were evaluated in the trimerization of various isocyanates. The performance depended greatly on the combination of the catalyst systems, and the [HTBD][OAc] (acetic acid) catalyst systems were considerably the most active in contrast to the corresponding DMAP and DBU counterparts. The [HTBD][OAc] catalyst system was capable of providing isocyanurates from the cyclotrimerization of various isocyanate substrates in excellent yields in seconds even under bulk conditions. A bifunctional catalytic mechanism over [HTBD][OAc] was proposed.
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