Crystal structure of 3,4'-diphenyl-3'-p-tolyl-4'H-spiro-[indan-2,5'-[1,2]oxazol]-1-one.

In the title compound, C30H23NO2, the five-membered rings are both in envelope conformations with the same spiro C atom as the flap. The benzene ring and the two phenyl rings are inclined to the mean plane of the indene ring system by 83.98 (8), 81.46 (8) and 72.31 (7)°. In the crystal, mol-ecules are linked by pairs of C-H⋯O hydrogen bonds into inversion dimers. The dimers are further connected by C-H⋯N inter-actions, forming layers parallel to (10-1).

Crystal structure of ethyl 2-amino-4-(4-chloro-phen-yl)-4H-1-benzothieno[3,2-b]pyran-3-carboxyl-ate.

The title compound, C20H16ClNO3S, is built up from three fused rings, one five- and two six-membered rings, linked to a 3-eth-oxy-carbonyl group and to a 4-chloro-phenyl ring. The hydropyran ring has a flattened envelope conformation, with the C atom substituted by the 4-chloro-phenyl ring as the flap (displaced by 0.077 (2) Šfrom the plane through the other atoms). The fused three-ring system is quasi-planar (r.m.s. deviation = 0.057 Å), with the largest deviation from the mean plane being 0.106 (1) Šfor the C atom substituted by the 4-chloro-phenyl ring. The 4-chloro-phenyl ring is approximately perpendicular to the mean plane of the fused ring system, as indicated by the dihedral angle of 77.32 (6)° between their mean planes. There is an intra-molecular N-H⋯O hydrogen bond forming an S(6) ring motif. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers with an R 2 (2)(12) ring motif. There are also short inter-molecular Cl⋯O inter-actions present [3.1226 (12) Å] between neighbouring mol-ecules.