Like aldehydes, cyclopentanone and pentan-2-one react with dimedone in a 1 : 2 ratio to give xanthenes. With a series of cyclohexanones, however, both dimedone and cyclohexane-1,3-dione give octahydrodibenzofuranones which are readily aromatised. In some cases, the intermediate 2-cyclohexenyldimedones have been isolated.
J. V. Greenhill, M. A. Moten and R. Hanke, J. Chem. Soc., Perkin Trans. 1, 1984, 1213 DOI: 10.1039/P19840001213
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