(<i>E</i>)-3-(Benzo[<i>b</i>]thiophen-2-yl)-2-(3,4,5-trimethoxyphenyl)acrylonitrile and (<i>Z</i>)-3-(benzo[<i>b</i>]thiophen-2-yl)-2-(3,4-dimethoxyphenyl)acrylonitrile
作者:Vijayakumar N. Sonar、Sean Parkin、Peter A. Crooks
DOI:10.1107/s0108270107054959
日期:2007.12.15
The title compounds, C20H17NO3S, (I), and C19H15NO2S, (II), were prepared by the reaction of benzo[b] thiophene-2-carbaldehyde with (3,4,5-trimethoxyphenyl) acetonitrile and (3,4-dimethoxyphenyl) acetonitrile, respectively, in the presence of methanolic potassium hydroxide. In (I), the C C bond linking the benzo[b] thiophene and the 3,4,5-trimethoxyphenyl units has E geometry, with dihedral angles between the plane of the bridging unit and the planes of the two adjacent ring systems of 5.2 (3) and 13.1 (2)degrees, respectively. However, in (II), the C = C bond has Z geometry, with dihedral angles between the plane of the bridging unit and the planes of the adjacent benzo[b] thiophene and 3,4-dimethoxyphenyl units of 4.84 (17) and 76.09 (7)degrees, respectively. There are no significant intermolecular hydrogen-bonding interactions in the packing of (I) and (II). The packing is essentially stabilized via van der Waals forces.