An efficient method for the preparation of perfluorooctylated aromatic and heteroaromatic compounds has been developed using photolysis of perfluoroazooctane (E)-1 upon 185 nm irradiation. The use of a two-phase system made up of a perfluorohexane solution of (E)-1 and a suitable aromatic compound has proved efficient for this reaction. The photolytic mechanism of (E)-1 upon 185 nm irradiation has also been investigated on the basis of quantum yield, light intensity dependence and UV–VIS spectra. It is shown that (E)-1 is photoisomerized by one photon absorption to the (Z)-isomer, with subsequent extrusion of nitrogen by a second photon absorption.
利用
全氟辛烷 (E)-1 在 185 纳米波长照射下的光解作用,开发出了一种制备
全氟辛基芳香族和杂芳香族化合物的有效方法。事实证明,使用由(E)-1 的
全氟己烷溶液和适当的芳香族化合物组成的两相体系可以有效地进行该反应。根据量子产率、光强依赖性和紫外-可见光谱,还研究了 (E)-1 在 185 纳米辐照下的光解机理。研究表明,(E)-1 通过一次光子吸收发生光异构化,生成 (Z)- 异构体,随后通过第二次光子吸收挤出氮。