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Potassium enolates of carboxylic acid trimethylsilyl esters, obtained upon interaction of bis(trimethylsilyl)ketene acetals with t-BuOK, react with anisole tricarbonyl chromium to give, directly upon iodine promoted oxidative demetalation, a mixture of the expected carboxylic acids and of bicyclic lactones resulting, on a formal point of view, from a double nucleophilic addition of the dianions of...
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