Oxidation of ethyl α-methylacetoacetate with lead dioxide gives 4,5-diethoxycarbonyl-3,4,5-trimethylcyclopent-2-enone, diethyl αα′-diacetyl-αα′-dimethylsuccinate, 4-ethoxycarbonyl-3,4-dimethylcyclohex-2-enone and diethyl 2,4,5-trimethyl-3-oxahex-4-enedioate as the major products.
R. Brettle and D. Seddon, J. Chem. Soc. C, 1970, 1320 DOI: 10.1039/J39700001320
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