Photochromic dihetarylethenes. 13. Optimization of conditions for the acylation of 2,5-dimethylthiophene with squaric acid dichloride |
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| Authors: | Krayushkin M M Shirinian V Z Belen"kii L I Shadronov A Yu Vorontsova L G Starikova Z A |
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| Institution: | (1) Russian Academy of Sciences, N. D. Zelinsky Institute of Organic Chemistry, 47 Leninsky prosp., 119991 Moscow, Russian Federation;(2) Russian Academy of Sciences, A. N. Nesmeyanov Institute of Organoelement Compounds, 28 ul. Vavilova, 119991 Moscow, Russian Federation |
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| Abstract: | The conditions for acylation of 2,5-dimethylthiophene with squaric acid dichloride were optimized, and 3,4-bis(2,5-dimethylthiophen-3-yl)cyclobut-3-ene-1,2-dione was obtained in good yield. X-ray diffraction analysis demonstrated that the by-product has the structure of 1a,1b-dichloro-5-(2,5-dimethylthiophen-3-yl)-3-hydroxy-4,5a-dimethyl-1b,4a,5,5a-tetrahydro-1aH-1-thiacyclopropaa]pentalen-2-one. |
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| Keywords: | 2 5-dimethylthiophene squaric acid dichloride acylation protonation oligomerization |
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