Two cis Ring-Fused exo N-Aryl Heterocycles: 1-Phenyl-2-(2,4,6-trimethylphenyl)decahydroquinolin-4-one and 1-(4-Trifluoromethylphenyl)-2-phenyldecahydroquinolin-4-one

For the title compounds, C₂₄H₂₉NO (I) and C₂₂H₂₂F₃NO (II), the cyclohexane ring adopts a chair conformation. Both compounds exhibit a cis ring-fused exo configuration. When the N atom bears a phenyl ring and the C(2) atom is substituted by a 2,4,6-trimethylphenyl group, (I), ring B lies in a chair conformation, the N atom being tetrahedral. When the N atom is substituted by a 4-trifluoromethyl group and the C(2) atom by a phenyl moiety as in (II), however, the B ring adopts a quasi-boat conformation, the N atom being planar.

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