Abstract
2-Alkoxy- and 2-alkylthio-1-benzopyrylium salts condense in the 2 position with methylene bases formed from methyl-substituted heterocyclic onium compounds. The 4-methoxy-1-benzopyrylium salt also reacts primarily in the 2 position, during which the benzopyrylium ring is cleaved. In addition, condensation also takes place in the 4 position with splitting out of the methoxy group.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 173–177, February, 1977.
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Tolmachev, A.I., Karaban, E.F. & Shulezhko, L.M. Reaction of 2- and 4- alk oxy - 1 - benzopyrylium salts with methylene bases of heterocyclic cations. Chem Heterocycl Compd 13, 137–141 (1977). https://doi.org/10.1007/BF00497862
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DOI: https://doi.org/10.1007/BF00497862