Earlier reports that diethyl 5-methylcyclo-oct-4-ene-1,1 -dicarboxylate was transformed into 5-methyl-9-oxobicyclo[3,3,1]non-3-ene-1-carboxylic acid by aqueous alkali and into 1 -hydroxymethyl-5-methylbicyclo [3,3,1]non-3-en-9-ol by reduction with lithium aluminium hydride are shown to be erroneous. These products arise from a bicyclic impurity formed by an acid-catalysed process.
G. L. Buchanan and G. A. R. Young, J. Chem. Soc., Perkin Trans. 1, 1973, 732 DOI: 10.1039/P19730000732
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