6,7-Diphenyl-5-thia-7-azaspiro[2.6]nonan-8-one

The asymmetric unit of the title compound, C19H19NOS, contains two independent molecules (A and B), in both of which the 1,3-thiazepan-4-one ring adopts a chair-type conformation. The dihedral angles between the two phenyl rings are 65.28 (8) and 60.31 (9)° for molecules A and B, respectively. In the crystal, molecules are linked by weak C—H⋯O interactions, resulting in a three-dimensional network.

The asymmetric unit of the title compound, C 19 H 19 NOS, contains two independent molecules (A and B), in both of which the 1,3-thiazepan-4-one ring adopts a chair-type conformation. The dihedral angles between the two phenyl rings are 65.28 (8) and 60.31 (9) for molecules A and B, respectively. In the crystal, molecules are linked by weak C-HÁ Á ÁO interactions, resulting in a three-dimensional network.

Experimental
A two-necked 25 ml pear flask was oven-dried, cooled under N 2 , and charged with a stir bar and N-[phenylmethylidene]aniline (1.087 g, 6 mmol). Tetrahydrofuran (2.3 mL) was added, the solid dissolved, and the solution was stirred.
The product eluted with 30-50% EtOAc/hexanes and was concentrated in vacuo to a white solid (0.4594 g).

Refinement
The C-bound H atoms were geometrically placed, with C-H = 0.93-0.97 Å, and refined as riding, with U iso (H) = 1.2U eq (C)

Figure 1
ORTEP view of the title comound. Thermal ellipsoids are drawn at 50% probability.    T min = 0.559, T max = 1 14502 measured reflections 7089 independent reflections 5751 reflections with I > 2σ(I) R int = 0.017  Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.  0.0408 (9) 0.0904 (14) 0.0452 (10) −0.0141 (9) −0.0019 (7) −0.0049 (9)