A Dendrimer Chiroptical Switch Based on the Reversible Intramolecular Photoreaction of Anthracene and Benzene Rings
作者:Wenjie Liu、Derong Cao、Jinan Peng、Hong Zhang、Herbert Meier
DOI:10.1002/asia.201000159
日期:——
Fréchet‐type dendrimers with 9‐benzyloxymethylanthracene cores were synthesized and characterized. The chiral source for the dendrimers was an (S)‐2‐methyl‐1‐butoxy group in the 3‐position of the benzene ring. Irradiation at 366 nm of a dilute benzene solution led to the formation of two diastereomers (1:1) through a quantitative intramolecular [4π+4π] cycloaddition between the central anthracene ring and
合成并表征了一系列具有9-苄氧基甲基蒽核心的Fréchet型树状聚合物。树枝状聚合物的手性来源是苯环3位上的(S)-2-甲基-1-丁氧基。通过在中央蒽环和相邻的苯环之间进行定量的分子内[4π+4π]环加成反应,在366 nm的稀苯溶液中进行辐照导致形成两个非对映异构体(1:1)。可以用254 nm的紫外线或高温逆转该过程。树突中的苯环起着光收集系统的作用。为可逆过程测得的旋光度显示出抗疲劳性。因此,已经创建了一种有前途的新型按摩疗法开关,其具有旋光度值作为输出信号。