Mm. Baradarani et al., A NAPHTHALENE-FUSED TRICYCLIC ORTHOAMIDE, Acta crystallographica. Section C, Crystal structure communications, 51, 1995, pp. 1345-1347
The crystal structure of 3a,6a,12b-triaza-1,2,3,3a,4,5,6,6a,12b, 12c-d
ecahydroperylene, C17H19N3, (6), shows that the naphthalene unit adopt
s an orientation orthogonal to the average plane of the triaza-trans-d
ecalin moiety. This forces two aromatic N-atom lone pairs to orient eq
uatorially and thus allows only partial overlap with the naphthalene p
i system.