2,4-Bis(3-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one

In the crystal structure, the title compound, C(22)H(25)NO(3), exists in a twin-chair conformation with equatorial orientations of the meta-methoxyphenyl groups on both sides of the secondary amino group. The title compound is a positional isomer of 2,4-bis(2-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one and 2,4-bis(4-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one, which both also exhibit twin-chair conformations with equatorial dispositions of the anisyl rings on both sides of the secondary amino group. In the title compound, the meta-methoxyphenyl rings are orientated at an angle of 25.02 (3)degrees with respect to each other, whereas in the ortho and para isomers, the anisyl rings are orientated at dihedral angles of 33.86 (3) and 37.43 (4)degrees, respectively. The crystal packing is dominated by van der Waals interactions and by an intermolecular N-H center dot center dot center dot O hydrogen bond, whereas in the ortho isomer, an intermolecular N-H center dot center dot center dot pi interaction (H center dot center dot center dot Cg = 2.75 angstrom) is found.