Abstract

the fragment indicates the significant conjugation. The other bond lengths and angles are quite typical, thus they don't call for further discussion. In the title compound, cyclohexanone ring adopts a half-chair conformation with the maximum deviation being 0.304(2) Â for CI5. The naphthyl and cyclohexenone moieties are not coplanar. The dihedral angle between the leastsquares planes is 77.72(8)°, which is slightly larger than its relative structures because of the more bulky naphthyl group, but much bigger than its acyclic /J-enaminone [4,5]. Unlike the acyclic /3-enaminones [4,5], the formation of the intramolecular hydrogen bond is forbidden [6] because of the torsional strain in the cyclic compounds. Thus, the secondary amine can only give rise

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