A series of 2-amino-3-cyano-4-aryl-9,10-dihydrobenzo[f]chromene derivatives were synthesised from arylaldehyde, malononitrile with 7-methoxyl-1,2,3,4-tetrahydronaphthalene-2-one in ethyl alcohol at refluxing temperature catalysed by KF-Al2O3. The structure of the product was confirmed by X-ray analysis.
X-ray crystallography for 4g: A single crystal 4g with dimensions of 0.56 mm λ 0.42 mm λ 0.42 mm was mounted on a Siemens P4 diffractometer. The data were collected at the temperature of 296(2) K with graphite monochromated MoKα (λ = 0.71073 Å) radiation, using the ω scan technique. 6289 independent reflections were collected, of which 3775 reflections with I>2σ(I) were considered to be observed. The structure was solved by direct method using SHELXTL program and expanded using Fourier technique. The non-hydrogen atoms were refined anisotropically the hydrogen atoms were positioned geometrically and refined as riding [C-H = 0.93-0.98Å, N-H = 0.86 Å and Uiso(H) = 1.2Ueq(C)]. A full-matrix least-squares refinement gave final R = 0.0376 and wR = 0.0843 with w = 1/[σ2 (Fo2) + (0.0485P)2 + 0.2685P], where P = (Fo2 + 2Fc2)/3. Empirical formula C22H20N2O2, FW = 344.40, T = 296(2) K, Triclinic, space group P–1, a = 10.120(1) Å, b = 13.127(1) Å, c = 15.203(2) Å, α = 67.841(9)°, β = 80.81(1) °, γ = 77.58(1)°, V = 1819.7(4) Å3, Z = 4, Dc = 1.257 Mg/m3, λ(MoKα) = 0.71073Å, μ = 0.081 mm−1, F(000) = 728. 1.45°<θ<25.00, S = 0.859, Largest
