When ketonic esters, which have a malonic ester residue in the /?-position to the carbonyl group, are brominated in methyl alcohol, the only product is a monobromo compound which has bromine a to carbonyl. :!. When the same esters are brominated in chloroform or carbon tetrachloride, the result is a mixture of monobromo derivatives. In one of these the bromine is a to carbonyl, in the other it is in the malonic ester residue. A third monobromo derivative was obtained by first introducing two

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... mine atoms a to carbonyl and then replacing one of these with hydrogen.