2-[2,6-Bis(4-methoxyphenyl)tetrahydrothiopyran-4-ylidene]malononitrile

Abstract

CommentIn the title molecule, 4-dicyanomethylene-r2,c6-bis(p-methoxyphenyl)tetrahydrothiopyran, C 22 H 20 N 2 O 2 S, the tetrahydrothiopyran ring adopts a chair conformation. The dicyanomethylene group in the 4-position and the p-methoxyphenyl groups at positions 2 and 6 have equatorial orientations. A crystallographic mirror plane bisects the molecule, passing through the S and opposite C atoms of the central ring (Fig. 1). No classical hydrogen bonds are found in the crystal structure. ExperimentalThe title compound was prepared from cis-2,6-bis(p-methoxyphenyl) tetrahydrothiopyran-4-one by adopting a general procedure described in the literature (Haller & Ludtke, 1976) and it was characterized using NMR techniques (Manimekalai & Anusuya, 2005). RefinementThe H atoms were positioned geometrically and allowed to ride on their parent atoms with C-H = 0.93-0.98 Å and U iso = 1.2-1.5U eq (C).