Hydrogen Bonding in 4,4-Dimethylcyclohexane-1,3-dione and 2,5,5-Trimethylcyclohexane-1,3-dione Monohydrate

The enol of 4,4-dimethylcyclohexane-1,3-dione (3-hydroxy-6,6-dimethylcyclohex-2-en-1-one, C₈H₁₂O₂) forms hydrogen-bonded spiral chains like those in 5,5-dimethylcyclohexane-1,3-dione, except for disorder of the optical isomers. 2,5,5-trimethylcyclohexane-1,3-dione monohydrate (enol form 3-hydroxy-2,5,5-trimethylcyclohex-2-en-1-one monohydrate, C₉H₁₄O₂.H₂O) forms hydrogen-bonded layers containing tetramolecular rings with a short OH...water hydrogen bond [2.428 (4) Å].

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