title: 3-Methyl-1,2,3,4,5,6,1',2',3',4'-deca-hydro-spiro-[benz[f]isoquinoline-1,2'-naphthalen]-1'-one.
abstract: The title compound, C(23)H(23)NO, is the product of a tandem transformation of the double Mannich base bis-(1-oxo-1,2,3,4-tertrahydro-2-naphtho-ylmeth-yl)amine hydro-chloride in HBr solution upon heating. The tetra-hydro-pyridine ring has a non-symmetrical half-chair conformation, whereas the cyclo-hexa-diene and cyclo-hexene rings adopt non-symmetrical half-boat conformations. The dihedral angle between the planes of the terminal benzene rings is 62.85 (6)°. The N atom has a trigonal-pyramidal geometry [sum of the bond angles = 332.4 (3)°]. In the crystal, mol-ecules form [001] chains via weak non-classical C-H⋯N hydrogen bonds. The chains are stacked along the b axis.
authors.affiliation: Institut National Polytechnique Félix HOUPHOUËT-BOIGNY, BP 1093, Yamoussoukro, Côte d'Ivoire.
authors.forename: Sohro
authors.initials: S
authors.lastname: Siaka
authors.forename: Anatoly T
authors.initials: AT
authors.lastname: Soldatenkov
authors.forename: Anastasia V
authors.initials: AV
authors.lastname: Malkova
authors.forename: Elena A
authors.initials: EA
authors.lastname: Sorokina
authors.forename: Victor N
authors.initials: VN
authors.lastname: Khrustalev