Synthesis and crystal structure of racemic (R∗,R∗)-2,2′-(1,4-phenyl ene)bis (3-phenyl-2,3,5,6-tetra hydro-4H-1,3-thia zin-4-one)

In the racemic title compound, C₂₆H₂₄N₂O₂S₂, one of the thia zine rings shows a twisted boat conformation (Q = 0.743 Å, θ = 92.1°) and the other a half-chair puckering (Q = 0.669 Å, θ = 54.3°). The terminal phenyl rings are almost parallel to each other [dihedral angle 21.71 (10)°]. Both of these rings are orthogonal to the central phenyl ring, subtending a dihedral angle of about 78° in each case. The extended structure is consolidated by C - H⋯O and C - H⋯S hydrogen bonds as well as aromatic ring inter actions of parallel-displaced and T-type. The mol ecule has approximate C₂local symmetry but this is not carried over to its three-dimensional structure or the inter molecular inter actions.