A new convenient procedure for the synthesis of photochromic N-alkyldithienylmaleimides was developed on the basis of the reaction of 3,4-bis(2,5-dimethyl-3-thienyl)furan-2,5-dione with primary amines. Photochromic properties of the products were examined.
properties in the solid state as in dilute chloroform solutions. These two diarylethenes show typical photochromic properties in chloroform and also in poly(methyl methacrylate) film. During the photochromism, fluorescence of the diarylethenes could be reversibly tuned.
of these two diarylethenes exhibits typical reversible absorption and fluorescence changes upon UV or visiblelight irradiation, and their diverse response to light irradiation is investigated by X-ray single crystal analysis and also DFT calculation. The investigation presented here provides valuable insight into the designing and development of diarylethene-based fluorescent switches in the solid
Synthesis of photochromic 2,3-bis(2,5-dimethyl-3-thienyl)-3-cyanoacrylates by the Beckmann rearrangement of a cyclobutenedione derivative
作者:Valerii Z. Shirinian、Mikhail M. Krayushkin、Valerii A. Barachevskii、Leonid I. Belen’kii、Aleksei A. Shimkin、Yuri P. Strokach
DOI:10.1070/mc2004v014n05abeh001916
日期:2004.1
An unusual Beckmann rearrangement was discovered in the reaction of 3,4-bis(2,5-dimethyl-3-thienyl)cyclobut-3-ene-1,2-dione with hydroxylamine hydrochloride to give esters of 2,3-bis(2,5-dimethyl-3-thienyl)-3-cyanoacrylic acid.