540 Chemie und zugeordnete Wissenschaften
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In the title compound, C23H19NO2, an oxazine Mannich base derivative, the oxazine ring has a half-chair conformation. The 2-hydroxynaphthalen-1-yl substituent is placed in an axial position. There is an intramolecular O-H...N hydrogen bond, forming an S(6) graph-set motif. In the crystal, molecules are connected by a pair of C-H...[pi] interactions into an inversion dimer, which is reinforced by another pair of weak C-H...[pi] interactions. The dimers are linked by a [pi]-[pi] interaction [centroid-centroid distance = 3.6268 (17) Å], consolidating a column along the a axis. Furthermore, the columns interact with each other by a weak C-H...[pi] interaction, generating a three-dimensional network.