Conclusions
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1.
Unsymmetrical 1, 1-bix (trifluoromethyl)-3, 3-bis (alkoxycarbonyl) allenes (I) and (II) undergo diene synthesis with phenylacetylene to form the corresponding γ-pyrans and further reaction products.
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2.
The γ-pyrans are converted to the α-pyrones by acids; the lactone ring of the latter is not affected by reflux in strongly acidic solution.
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Part 7 [1].
Translated from Izvestiya Akademiya Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2517–2520, November, 1977.
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Mirzabekyants, N.S., Cheburkov, Y.A. & Knunyants, I.L. Fluorine-containing allenes 8. Reaction of 1,1-bis (trifluoromethyl)-3,3-bis (alkoxycarbonyl) allenes with phenylacetylene. Russ Chem Bull 26, 2332–2335 (1977). https://doi.org/10.1007/BF00958720
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DOI: https://doi.org/10.1007/BF00958720