Conclusions
-
1.
By the action of the Na2S2O8-CuCl2 system, alkanoic acids RR′CHCH(R″)CH2COOH convert into γ-lactones
with high regioselectivity.
-
2.
A reaction mechanism was proposed, including the formation from alkanoic acids of alkylcarbonyloxyl radicals, their rearrangement with 1,5-migration of the H atom into 3-carboxylalkyl radicals, and oxidative cyclization of the latter into γ-lactones.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2318–2325, October, 1982.
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Troyanskii, É.I., Svitan'ko, I.V. & Nikishin, G.I. Direct oxidation of alkanoic acids to lactones. Russ Chem Bull 31, 2041–2046 (1982). https://doi.org/10.1007/BF00950650
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DOI: https://doi.org/10.1007/BF00950650