The reaction of 3,4-dichlorocyclobutene-1,2-dione with methyl 2-methyl-4H-thieno[3,2-b]pyrrole-5-carboxylate occurs at the thiophene ring of the latter, yielding a product in which the thienopyrrole fragments are linked through a dioxocyclobutene ring. Oxidation of this product with hydrogen peroxide gives previously unknown thermally stable photochromic system containing thienopyrrole groups linked through a 2,5-dioxofuran bridge.
Photochromism of Thienyl-Containing Dihetarylethenes with Five-Membered Cyclic Bridges
作者:V. A. Barachevsky、Yu. P. Strokach、M. M. Krayushkin
DOI:10.1080/15421400590946352
日期:2005.5.1
Spectral-kinetic characteristics of a number of new photochromic dihetaryethenes with different five-membered cyclic bridges are measured and discussed. It was shown that these characteristics depend on a bridge structure as well as a nature of substituents in the thienyl fragments.
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作者:M. M. Krayushkin、V. N. Yarovenko、S. L. Semenov、I. V. Zavarzin、A. Yu. Martynkin、B. M. Uzhinov
DOI:10.1023/a:1026069007586
日期:——
New photochromic 1,2-dihetarylethenes containing maleimide-bridged thieno[3,2-b]pyrrole fragments with aliphatic and aromatic substituents at the nitrogen atom were synthesized.