2,9-bis(3-nitrophenyl)-1-azaadaman-tan-4-one

The title compound, 2,9-bis(3-nitrophenyl)-1-azatricyclo[3.3.1.1(3,7)]decan -4-one, C21H19N3O5, has a tricyclic structure. The torsion angles may be us ed to describe the relationship of the carbonyl group to the adjacent faces , whereby it is seen that the angles on the face of the arylpiperidinone si de [122.0 (3) and -122.0 (3)degrees] are greater than those on the cyclohex anone side [-119.8 (4) and 119.9 (4)degrees]. Although these differences ma y explain a facial selectivity during nucleophilic addition to the carbonyl group, the presence of the aryl rings is probably also important.