Synthesis and characterization of a new acid molten salt and the study of its thermal behavior and catalytic activity in Fischer esterification
作者:Lia Zaharani、Nader Ghaffari Khaligh、Mohd Rafie Johan、Hayedeh Gorjian
DOI:10.1039/d0nj06273a
日期:——
A new acid molten salt was prepared and its structure elucidation was conducted by FTIR, 1D NMR, 2D NMR, and mass spectrometry. Further support to elucidate the chemical structure of the 1H,4H-piperazine-N,N′-diium ring of the new acid molten salt was achieved by 1H and 13C NMR, and COSY analyses of 1H,4H-piperazine-N,N′-diium dibromide, which is synthesized and characterized for the first time in
制备了一种新的酸性熔融盐,并通过FTIR,1D NMR,2D NMR和质谱对结构进行了阐明。进一步支持阐明1的化学结构ħ,4 ħ -哌嗪Ñ,Ñ '新酸熔盐-diium环通过实现1 H和13 C NMR,和1的COZY分析ħ,4 ħ -哌嗪-N,N'-二溴化二铵,在本工作中首次合成并表征。FTIR和NMR光谱分析以及pH和滴定分析排除了[SO 4 ] 2-的形成和过量的H 2 SO 4的存在。此外,在DMSO- d 6中未检测到[HSO 4 ] -的酸质子的区别峰。还记录了酸性熔融盐的热相变和热稳定性,这证明了指示剂和硫酸氢根阴离子之间的强相互作用。根据新熔融盐的酸度,我们鼓励研究使用冰醋酸对正戊醇进行乙酰化的催化活性。获得乙酸戊酯,转化率为89.0%,分离产率为78.0%。残留物的1 H NMR光谱显示过量的HOAc和熔融盐,而上层相的1 H NMR谱显示纯的乙酸戊酯。分离上层相后,将残余