四种AB 2单体,N- [3-或4-双(4-羟基苯基)甲苯酰基] -4-氯邻苯二甲酰亚胺和N- {3-或4- [1,1-双(4-羟基苯基)]乙基苯基}-制备了4-氯邻苯二甲酰亚胺,并用于合成带有羟基端基的超支化聚醚酰亚胺。这些超支化聚醚醚具有中等分子量,分布范围广,并且在177至230°C之间显示出玻璃化转变温度(T g s)。热重分析测量显示分解温度为5%的失重温度(T d 5%),范围为240至281°C。分析使用11 H NMR光谱表明四种类型的超支化聚醚酰亚胺具有相似的支化度(约60%)。这些聚合物通过在羟基端基上的酰化或亲核取代反应进行改性。转化效率取决于改性反应的类型,改性剂和反应条件。通过支化端基,可以提高超支化聚醚酰亚胺的热稳定性和溶解性。
四种AB 2单体,N- [3-或4-双(4-羟基苯基)甲苯酰基] -4-氯邻苯二甲酰亚胺和N- {3-或4- [1,1-双(4-羟基苯基)]乙基苯基}-制备了4-氯邻苯二甲酰亚胺,并用于合成带有羟基端基的超支化聚醚酰亚胺。这些超支化聚醚醚具有中等分子量,分布范围广,并且在177至230°C之间显示出玻璃化转变温度(T g s)。热重分析测量显示分解温度为5%的失重温度(T d 5%),范围为240至281°C。分析使用11 H NMR光谱表明四种类型的超支化聚醚酰亚胺具有相似的支化度(约60%)。这些聚合物通过在羟基端基上的酰化或亲核取代反应进行改性。转化效率取决于改性反应的类型,改性剂和反应条件。通过支化端基,可以提高超支化聚醚酰亚胺的热稳定性和溶解性。
A beneficial, scalable and efficient methodology for the synthesis of aniline-based triarylmethanes has been established through the double Friedel-Crafts reaction of commercial aldehydes and primary, secondary or tertiary anilines using Brönstedacidicionicliquid as a powerful catalyst, namely [bsmim][NTf2]. This protocol was successfully performed under metal- and solvent-free conditions with a
An efficient and practical synthesis of triaryl and trisindolylmethanes is reported via the bisarylation of aryl aldehydes with activated arenes. The new method features mild solvent-free reaction conditions, in most cases nearly stoichiometric reagent ratios, catalytic amount of the readily available, easily-handled, recoverable and reusable Brønsted acid catalyst o-benzenedisulfonimide.
Efficient synthesis of triarylmethanes via bisarylation of aryl aldehydes with arenes catalyzed by silica gel-supported sodium hydrogen sulfate
作者:Yixin Leng、Fang Chen、Li Zuo、Wenhu Duan
DOI:10.1016/j.tetlet.2010.02.157
日期:2010.4
An efficient synthesis of triarylmethanes has been developed via bisarylation of aryl aldehydes with arenes catalyzed by silicagel-supportedsodiumhydrogensulfate in a solvent-free system. The new method features high yield, mild reaction conditions, and environmental friendliness.