文献类型：期刊文献

英文题名：Fast cyclotrimerization of a wide range of isocyanates to isocyanurates over acid/base conjugates under bulk conditions

作者：Wu, Li[1];Liu, Wei[2];Ye, Jinxing[2];Cheng, Ruihua[1]

机构：[1]East China Univ Sci & Technol, Coll Chem Engn, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Pharmaceut Proc Chem, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2020

卷号：145

外文期刊名：CATALYSIS COMMUNICATIONS

收录：;EI(收录号：20202708895471);WOS:【SCI-EXPANDED(收录号:WOS:000564695100003)】；

语种：英文

外文关键词：Cyclotrimerization; Isocyanate; Isocyanurate; Acid/base conjugates

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.