(4aR*,8aS*)-2,3-Diphenyl-4a,5,6,7,8,8a-hexa-hydro-quinoxaline.
In the title compound, C(20)H(20)N(2), the quinoxaline ring adopts a very distorted half-chair conformation [N=C-C=N = 22.7 (2)° for the nominally coplanar atoms] and the cyclo-hexane ring adopts a chair conformation. The quinoxaline and cyclo-hexane rings are cis-fused. The two phenyl rings form a dihedral angle of 63.88 (7)°.
Department of Chemistry, Tongji University, Shanghai 200092,  People's Republic of China.
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