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Dorofeenko, G.N., Ryabinina, V.E. & Kuznetsov, E.V. A new method for the synthesis of 2,6-diaryl-substituted pyrylium salts by the acylation of phenol ethers with glutaric acid in the presence of polyphosphoric acid (PPA). Chem Heterocycl Compd 5, 136–137 (1969). https://doi.org/10.1007/BF01031800
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DOI: https://doi.org/10.1007/BF01031800