Photochromic dihetarylethenes |
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Authors: | L G Vorontsova M M Krayushkin Z A Starikova M A Kalik F M Stoyanovich O Yu Zolotarskaya D L Dzhavadov |
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Institution: | (1) N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913 Moscow, Russian Federation;(2) A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 117813 Moscow, Russian Federation |
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Abstract: | The structures of two hetarylethene photochromes,viz., 1,2-bis(2-ethyl-5-ethylsulfonylthien-3-yl)perfluorocyclopentene and 1,2-bis5-(benzoxazol-2-yl)-2-methylthien-3-yl]perfluorocyclopentene,
were established by X-ray diffraction analysis. The conformational parameters of the title compounds are considered. The cyclopentene
ring in the former compound is planar and this ring in the latter compound adopts an envelope conformation. There are no overall
conjugated systems in the molecules under study. In both structures, the dihetaryl fragments are rotated with respect to the
perfluorocyclopentene fragments by ∼55°. The thiophene and benzoxazole rings in 1,2-bis5-(benzoxazol-2-yl)-2-methylthien-3-yl]perfluorocyclopentene
are coplanar.
For Part 3, see Ref. 1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 74–77, January, 2000. |
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Keywords: | dithienylethenes 1 2-bis(2-ethyl-5-ethylsulfonylthien-3-yl)perfluorocyclopentene 1 2-bis[5-(benzoxazol-2-yl)-2-methylthien-3-yl]perfluorocyclopentene photochromes X-ray diffraction analysis conformation |
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