A unique chemical transformation, the base-induced aerobic dimerization of ethyl 4-(2,5-dimethylthiophen-3-yl)-3-ketobutanoate leading to photochromic diarylethene with a 4-hydroxy-4-methylcyclopent-2-ene-1-one as an ethene bridge, is described. This compound is easily subjected to various chemical modifications and can be used as a new diarylethene precursor to produce photoactive compounds with desired properties and functions.

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A Convenient Alternative Method for the Synthesis of Dithienylacetylenes. -A convenient two-step approach to the formation of dithienylacetylenes (IV) is developed. The simple procedure as well as the readily available starting materials suggest that this method may find several applications in the preparation of photochromic dithienylethenes with enhanced characteristics. -(LVOV*, A. G.; MILEVSKY, N. A.; SHIRINIAN, V. Z.; KRAYUSHKIN, M. M.; Chem. Heterocycl. Compd. (N. Y., NY, U. S.) 51 (2015) 10, 933-935, http://dx.