The ten-membered fused ring system in the title compound, C(21)H(16)N(2)O(2), is planar (r.m.s. deviation = 0.03 Å). The phenyl substituent is aligned at 15.1 (1)° with respect to the mean plane through this system, whereas the phenyl ring of the benzyl substitutent is aligned at 84.4 (1)°.

DOI: 10.1107/S1600536809039944

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@inproceedings{Benzeid20091Benzyl3phenylquinoxalin21Hone, title={1-Benzyl-3-phenyl­quinoxalin-2(1H)-one}, author={Hanane Benzeid and Nathalie Saffon and Bernard Garrigues and El Mokhtar Essassi and Seik Weng Ng}, booktitle={Acta crystallographica. Section E, Structure reports online}, year={2009} }