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化工学报  2015 

醇羟基反应活性与DBU/C3-醇/CO2离子化合物稳定性

DOI: 10.11949/j.issn.0438-1157.20150162, PP. 4163-4169

Keywords: 离子化合物,DBU,,CO2,活性,稳定性

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Abstract:

利用红外光谱、核磁共振和热重分析表征了1,8-二氮杂环[5,4,0]十一烯-7(DBU)和CO2分别与C3-醇,即正丙醇、异丙醇、1,2-丙二醇、1,3-丙二醇和甘油,反应生成的离子化合物的组成和结构,研究了伯羟基和仲羟基与DBU和CO2反应的活性,以及空间位阻对羟基反应活性和生成的离子化合物的热稳定性的影响。结果表明,DBU+C3-醇+CO2体系中伯羟基比仲羟基具有更高的反应活性,反应产物更稳定。由于空间位阻和电子效应等影响,二元醇中第2个羟基的反应活性远低于第1个羟基。在DBU+甘油+CO2体系中由于空间位阻和电子效应的影响,当DBU和甘油的摩尔比为3:1时,其中1位羟基的转化率可达100%,3位羟基的转化率约为34%,而2位的仲羟基反应很少。

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