meta-寡聚联苯 - 通过选择性米尔反应合成及光化学性质。
meta-Oligoazobiphenyls - synthesis via site-selective Mills reaction and photochemical properties.
机构信息
University of Basel, Department of Chemistry, St. Johanns-Ring 19, 4056 Basel, Switzerland.
出版信息
Beilstein J Org Chem. 2012;8:877-83. doi: 10.3762/bjoc.8.99. Epub 2012 Jun 13.
The investigation of multi-photochromic compounds constitutes a great challenge, not only from a synthetic point of view, but also with respect to the analysis of the photochemical properties. In this context we designed a novel strategy to access meta-oligoazobiphenyls via site-selective Mills reaction and Suzuki cross-coupling in a highly efficient iterative way. Photochemical examination of the resulting monomeric and oligomeric azo compounds revealed that the overall degree of switching was independent of the connected azo-units. However, one of the azobonds in the bis-azobiphenyl is isomerized preferentially despite the high structural similarity.
多光致变色化合物的研究是一个巨大的挑战,不仅从合成的角度来看,而且从光化学性质的分析来看也是如此。在这种情况下,我们设计了一种新的策略,通过选择性的米尔斯反应和铃木交叉偶联,以高效的迭代方式来获得间位寡聚偶氮苯。对得到的单体和齐聚物偶氮化合物的光化学研究表明,整体的开关程度与连接的偶氮单元无关。然而,尽管结构非常相似,双偶氮联苯中的一个偶氮键还是优先异构化了。