Photochromic heterocyclic fulgides. Part 1. Rearrangement reactions of (E)-α-3-furylethylidene(isopropylidene)succinic anhydride
作者:Harry G. Heller、Stephen Oliver
DOI:10.1039/p19810000197
日期:——
7-trimethylbenzo[b]furan-5,6-dicarboxylic anhydride (7,7a-DHBF)(8) in near quantitative yield. The latter ring-opens in a conrotatory mode to the title compound on exposure to white light, and shows a slow suprafacial 1,5-H shift on heating above 100 °C. The 7a-deuterio-derivative of (8) does not undergo a 1,5-D shift even at 140 °C. The 2,5-dideuterio-derivative of fulgide (6) shows a reversible intramolecular
标题化合物(6)进行光化学旋转和热旋转闭环反应,得到红色的7,7a-二氢-4,7,7-三甲基苯并[ b ]呋喃-5,6-二羧酸酐(7,7a-DHBF)( 8)以接近定量的产量。后者在暴露于白光下以旋光方式打开标题化合物的环,并在加热至100°C以上时显示缓慢的表面上的1,5-H位移。(8)的7a-氘代衍生物即使在140°C时也不会发生1,5-D位移。激肽(6)的2,5-二氘代衍生物显示出在室温下可逆的分子内氢氘交换,得到(E,E)-α-5-氘代-3-呋喃基亚乙基(单十二烷基异亚丙基)琥珀酸酐。描述了弗利吉德(6)和7,7a-DHBF(8)的酸催化反应。