摘要
以金属酞菁为催化剂,2,5-二羧酸-3,4-二烷氧基噻吩在水相中脱羧,以较高的产率和纯度制得3,4-二烷氧基噻吩,避免了有机极性溶剂的使用,催化剂重复使用8次仍表现出优异的催化性能.另外,通过简易的水蒸气蒸馏法即可分离出产物.该法具有环境友好、操作简易和反应时间短等优点,是一种制备3,4-二烷氧基噻吩的绿色方法.
3,4-Dialkoxythiophenes are electron rich and their polymers have a narrow energy gap, so they have recently attracted consider- able attention in the field of organic semiconducting materials. However, the traditional synthetic approach suffers from some drawbacks, so the development of efficient methods for the synthesis of 3,4-dialkoxythiophenes is needed. A novel, efficient decarboxylation of 2,5-dicarboxy-3,4-dialkoxythiophenes was achieved in excellent yields （up to 95%） and purities using metal phthalocyanines in water, which avoids the use of organic polar solvents, and the recovered catalyst was successfully used in subsequent reactions. Furthermore, the desired products, 3,4-dialkoxythiophenes, were conveniently separated by steam distillation. This method has several advantages such as environ- mental friendliness, ease of manipulation, and a short reaction time. This environmentally friendly procedure represents a promising green route for the d ecarboxylation of these important compounds.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第8期1262-1265,共4页
基金
陕西省教育厅科学研究计划项目(09JK744)
西安市科技计划项目(CXY1123(3))~~
关键词
脱羧
3
4-二烷氧基噻吩
酞菁
合成
绿色化学
decarboxylation
3,4-dialkoxythiophene
phthalocyanine
synthesis
green chemistry
