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1.中国矿业大学 化工学院,江苏 徐州 221116
2.中国矿业大学 碳中和研究院,江苏 徐州 221116
3.中电华创电力技术研究有限公司,上海 200086
郑修畅(2000—),硕士研究生,研究方向为CO2转化利用,E-mail:919969359@qq.com。
倪中海(1976—),博士,教授,研究方向为功能有机材料,E-mail:nizhonghai@cumt.edu.cn。
收稿日期:2024-04-30,
修回日期:2024-05-29,
纸质出版日期:2025-02-25
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郑修畅,李国玲,赵云等.以CO2为羧基源温和高效制水杨酸类化合物[J].低碳化学与化工,2025,50(02):53-60.
ZHENG Xiuchang,LI Guoling,ZHAO Yun,et al.Mild and efficient preparation of salicylic acid compounds with CO2 as carboxyl source[J].Low-carbon Chemistry and Chemical Engineering,2025,50(02):53-60.
郑修畅,李国玲,赵云等.以CO2为羧基源温和高效制水杨酸类化合物[J].低碳化学与化工,2025,50(02):53-60. DOI: 10.12434/j.issn.2097-2547.20240194.
ZHENG Xiuchang,LI Guoling,ZHAO Yun,et al.Mild and efficient preparation of salicylic acid compounds with CO2 as carboxyl source[J].Low-carbon Chemistry and Chemical Engineering,2025,50(02):53-60. DOI: 10.12434/j.issn.2097-2547.20240194.
水杨酸类化合物是一种广泛用于医药、香料、染料、农药和橡胶助剂等精细化学品的重要原料。然而基于Kolbe-Schmitt反应,由CO
2
作为羧基源制备水杨酸类化合物时存在温度高、压力高、反应时间长和收率低等问题。提出了一种通过CO
2
羧化苯酚或4-取代基苯酚合成水杨酸类化合物的新方法。以KOH为脱质子碱,二甲苯为溶剂,Cs
2
CO
3
、K
2
CO
3
和2
4
6-三甲基苯酚钾盐(TMPK)为共催化剂,高效羧化苯酚和4-取代基苯酚制备水杨酸类化合物,并表征了各羧化产物的理化性质。系统考察了催化剂用量、CO
2
压力、温度、助催化剂用量、反应时间和反应底物等对苯酚和4-取代基苯酚羧化反应的影响,提出了碳酸盐与TMPK共催化合成水杨酸和5-取代基水杨酸可能的反应机理。结果显示,Cs
2
CO
3
+ TMPK的催化剂组合有效优化了反应条件,实现了温和条件(温度为120 ℃、 CO
2
压力为0.5 MPa、
n
(Cs
2
CO
3
):
n
(TMPK):
n
(原料)为1:1:1和反应时间为4 h)下CO
2
高效羧化苯酚(单程收率为60%)和4-取代基苯酚(单程收率为60%~90%)制备水杨酸类化合物。以该法合成的羧化产物邻位选择性高达100%。
Salicylic acid compounds are an important raw material widely used in fine chemicals such as medicine
spices
dyes
pesticides and rubber additives
etc. However
based on the Kolbe-Schmitt reaction
the preparation of salicylic acid compounds with CO
2
as a carboxyl source has some problems
such as high temperature
high pressure
long reaction time and low yield. A new method for the synthesis of salicylic acid compounds by CO
2
carboxylation phenol and 4-substituted phenol was presented
which uses KOH as deprotonation base
xylene as solvent
Cs
2
CO
3
K
2
CO
3
and 2
4
6-trimethylphenol potassium salt (TMPK) as cocatalysts to achieve CO
2
efficient carboxylation phenol and 4-substituted phenol. The physicochemical properties of each carboxylation product were characterized. The effects of catalyst dosage
CO
2
pressure
temperature
cocatalyst dosage
reaction time and reaction substrate on the carboxylation reaction of phenol and 4-substituted phenol were systematically investigated. The po
ssible reaction mechanism of the synthesis of salicylic acid and 5-substituted salicylic acid cocatalyzed by carbonate and TMPK was proposed. The results show that the catalyst combination of Cs
2
CO
3
+ TMPK effectively optimizes the reaction conditions. Under mild conditions
the preparation of salicylic acid compounds by efficient CO
2
carboxylation phenol (one-way yield of 60%) and 4-substituted phenol (one-way yield of 60%~90%) was realized. The
ortho
-selectivity of carboxylation products synthesized by this method is as high as 100%.
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