Abstract
Heating of 2,3-cycloalkenobenzopyrylium salts in acetic anhydride with excess formylating agent (dimethylformamide, formanilide, N-formylmorpholine, and N-phenyl-N-methyl-aminoacrolein) gives monoiminium salts, the hydrolysis of which yields aldehydes or, in the presence of hydrosulfide, thioaldehydes. On treatment with the Vilsmeier complex, 1-methylquinaldinium salts give diiminium salts, which are hydrolyzed to the corresponding aldehydes.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 733–736, June, 1971.
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Shelepin, N.E., Loseva, N.S., Nivorozhkin, L.E. et al. Formylation and vinylformylation of 2,3-cycloalkenobenzopyrylium salts. Chem Heterocycl Compd 7, 684–686 (1971). https://doi.org/10.1007/BF00476806
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DOI: https://doi.org/10.1007/BF00476806