A Trimer from 5,5-Dimethylcyclohexan-1,3-dione Containing an O-Protonated Furan Ring

Reaction of 5,5-dimethylcyclohexan-1,3-dione with ammonia in ethanol gave a trimer, 1,2,3,4,6,7,8,9,11,12,13,14-dodecahydro-3,3,8,8,12,12-hexamethyl-1,6,14- trioxobenzo[b]benzo[4,5]furo[3,2-d]oxoninium hydroxide, C₂₄H₃₁O₅⁺.0.41OH^-, containing a nine-membered lactone ring and a furan as well as two cyclohexane groups. The furan ring is partially protonated at the O atom with a disordered hydroxide counterion.

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