非共轭双发色团体系的光化学 1: 双香豆素氧乙酸多次甲基二醇酯的合成及光反应研究

本文报道了双香豆素氧乙酸多次甲基二醇酯的合成及分子内光环化加成反应的研究。结果表明, 由于两发色团间长链的限制, 所有这些双酯在氯仿溶液中直接照射都得到唯一的syn-HT结构产物, 并且产物的产率随着链长的增加而降低。通过X-射线四圆衍射测定了环化产物3b的晶体结构。

Photochemistry of nonconjugated bichromophoric systems 1: Synthesis and photoreaction of polymethylene bis-coumarinyloxyacetates

A series of polymethylene bis-coumarinyloxyacetates have been synthesized and their intramolecular photochemical cyclomerization have been studied. It was found that only syn-HT configuration products were obtained when these bis-esters were directly irradiated in chloroform, and the yields of the products decreased with the increase of chain length. The crystal structure of product 3b was determined by X-ray diffraction analysis.