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Photochromic diarylethenes with an additional p system in the ethene bridge were synthesized by the condensation of 2,3-bis(2,5-di- methyl-3-thienyl)cyclopent-2-en-1-one with aromatic aldehydes. Absorption bands maxima of the initial and cyclic forms of the substances were determined and their thermal stability was studied.
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Lonshakov et al. (2013) studied this question.
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