In the presence of a mediator (sodium iodide) acetylacetone dimerizes with the formation of 3,4-diacetylhexane-2,5-dione, with a yield up to 90%. Salts of 2-halosubstituted 1,3-diketones form more highly enolized cyclic 1,3-diketones — 1,3-cyclohexanedione and dimedone under analogous conditions, with a yield up to 90%.
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Élinson, M.N., Lizunova, T.L. & Nikishin, G.I. Electrochemical oxidation of 1,3-diketones in the presence of hydrohalic acid salts. Russ Chem Bull 41, 123–126 (1992). https://doi.org/10.1007/BF00863926
- electrochemical oxidation
- sodium salt of 2-halosubstituted 1,3-diketones