Summary
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1.
An accessible method was developed for the preparation of 2,4-dialkylthiophthenes and 1,6-dialkylthieno[3, 2-b] thiophenes.
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2.
By the cyclization of (3-acetyl-5-ethyl-2-thienylthio)acetic and (2-acetyl-5-ethyl-3-thienylthio)acetic esters good yields were obtained of 5-ethyl-3-methyl-2-thiophthenecarboxylic and 5-ethyl-3-methylthieno[3,2-b]-thiophene-2-carboxylic acids, and by the decarboxylation of these 2-ethyl-4-methylthiophthene and 2-ethyl-6-methylthieno[3,2-b]thiophene, respectively, were obtained.
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3.
Some transformations of 2-ethylthiophthene were studied.
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Gol'dfarb, Y.L., Litvinov, V.P. Investigation in the thiophthene series. Russ Chem Bull 12, 317–322 (1963). https://doi.org/10.1007/BF00846405
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DOI: https://doi.org/10.1007/BF00846405