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.

Abstract

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.

摘要

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。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3567/3388877/762aa72bc836/Beilstein_J_Org_Chem-08-877-g002.jpg

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