The i.r., Raman, and ' H n.m.r. spectra of 2,2-diacetylethenamines (3) and 2-aminomethylene-5,5-dimethylcyclohexane-l,3-diones (4) show that these substances exist exclusively in the chetated enamino-diketone form, and that the conjugated system contained in them is essentially planar. The open-chain enamino-diketones (3) exist either in the solid state or in solution in the ZZE-conformation
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