Synthesis and Photoswitching Studies of OPE-Embedded Difurylperfluorocyclopentenes
作者:Jannic Wolf、Iris Eberspächer、Ulrich Groth、Thomas Huhn
DOI:10.1021/jo401065b
日期:2013.9.6
and hydrolysis furnished 5 in good overall yield. Substituents R1 and R2 in the OPE portion were either electron-withdrawing or electron-donating, and their influence on the photostability and photoswitching characteristics of 7a–e was studied. All resulting molecules show reversible photochromism between the colorless off and the deeply colored on states when irradiated with light of 313 and 576 nm
我们报告了五个光致变色分子开关7a – e的合成和光化学行为,这些开关与基于不同取代的低聚(亚苯基乙炔基)(OPE)构件的连接的分子线有关。可切换分子导线7A - ë建于由取代的iodotolans会聚途径6A - Ë和1,2-双(2-甲基-5- ethynylfuran -3-基)全氟环戊烯5由2倍Sonogashira偶联。由相应的双醛2通过[PPh 3 CHBr 2 ] Br·CH 3的Wittig型烯化反应制得化合物5CN,然后在0°C的温和相转移条件下消除成溴炔烃。用i - PrMgCl·LiCl进行卤素-金属交换并进行水解,得到5的总收率良好。OPE部分的取代基R 1和R 2是吸电子的或给电子的,它们对7a - e的光稳定性和光开关特性的影响被研究了。当分别用313和576 nm波长的光照射时,所有得到的分子在无色关闭状态和深色打开状态之间均显示可逆的光致变色现象。当使用吸电子