Photocyclization reaction of a diarylmaleimide derivative in polar solvents.
Photocyclization reaction of a diarylmaleimide derivative in polar solvents.
复制标题
二芳基马来酰亚胺衍生物在极性溶剂中的光环化反应。
作者：
M. Ohsumi;M. Hazama;Tuyoshi Fukaminato;M. Irie
研究了具有两个噻吩环的对称二芳基马来酰亚胺衍生物（1）和具有S，S-二氧化噻吩环和噻吩环作为芳基部分的非对称衍生物（2）在各种溶剂中的光致变色性。随着溶剂极性的增加，光环化量子产率逐渐降低，在乙醇和乙腈等极性溶剂中没有观察到反应;另一方面，没有观察到光环化反应如此强的溶剂依赖性，这种不同的行为归因于S，S-二氧化噻吩环较弱的给电子能力。
Photochromism of a symmetric diarylmaleimide derivative, having two thiophene rings (1), and a non-symmetric derivative having a S,S-dioxide thiophene ring and a thiophene ring (2) as the aryl moieties, was studied in various solvents. The photocyclization quantum yield of gradually decreased with increasing the solvent polarity and the reaction was not observed in polar solvents, such as ethanol and acetonitrile; on the other hand, such a strong solvent dependence of the photocyclization reaction was not observed for ; the different behavior is attributed to the weaker electron donating ability of the S,S-dioxide thiophene ring.