Crystal structure of (Z)-2-amino-4-(2-amino-2-(4-bromophenylthio)-1- cyanovinyl)-6-bromo-4H-chromene-3-carbonitrile, C₁₉H ₁₂Br₂N₄OS

(Equation presentation) (Table presentation) Source of material 5-bromo-2-hydroxybenzaldehyde (5.0 mmol, 2.02 g), malononitrile (10.1 mmol, 0.67 g) and 4-bromobenzenethiol (5.0 mmol, 0.97 g) were dissolved in ethanol (20 mL). Piperidine (0.5 mmol, 0.05 mL) was added to the solution and the reaction mixture stired at room temperature for 1.5h. The solution was filtered, and a white solid was obtained (2.16 g, 85.7% yield). Recrystallization from a tetrahydrofuran solution at room temperature yielded crystals suitable for single-crystal X-ray diffraction. Experimental details H atoms were positioned geometrically with C-H = 0.93, 0.98 and N-H = 0.86 Å for aromatic, methyl, and amino groups, respectively, and riding on their parent atoms, withUiso(H) = 1.2 (or 1.5 for methyl groups) times Ueq(C). Discussion (Z)-2-amino-4-(2-amino- 2-(4-bromophenylthio)-1-cyanovinyl)- 6-bromo-4H-chromene-3-carbonitrile is an important derivative of Chromene [1]. In the ctystal structure, intermolecular N-H...N hydrogen bonds link themolecules into chains, in which may be effective in the stabilization of the structure. (Table presentation).