Étude Structurale Des Stilbènes I. Structures Par Diffraction de Rayons X de Trois α‐Cyanostilbènes

The X-Ray structures of four methyl a,B-diphenylacrylate derivatives were solved by direct methods from diffractometer data. (I) (Z)-methyl B-p-nitre phenyl-a-phenylacrylate, C16H13NOr, is monoclinic, P21/n, with a = 8.296(1), b = 6.703(2), c = 24.863(5)6, 6 = 96.25(1)', (Z)methyl a-p-nitrophenyl-6-phenylacrylate, C16H13N04, is triclinic, P 1 , with a = 14.:33(3), b = 10.048(2), c = 9.907(2)&, a = 80.75(1), B = 92.98(1), y = 92.48 ( 2 ) , v = 1395.6(5)A3, Z = 4. (111) (E)-methyl B-p-nitrophenyl-a-phenylacrylate, C I~H~~N O~, is monoclinic, C c , with a = 5.819(2), b = 16.610(5), c = 14.843 (4)&, 6 = 96.14(2)', V = 1426.4(7)&', Z = 4. (IV) (E)-methyl 6-methyl-B-pnitrophenyl-a-phenylacrylate, C17H15N04, is monoclinic, P21/a, with a = 13.751 (4), b = 11.145(3), c = 10.956(4)A, 6 = 116.42(2)', V = 1503.7(8)A3, Z = 4.ester substituents are generally twisted out of the ethylenic bond mean plane to avoid steric hindrance : only phenyl a in molecule I1 and ester group in 111 are coplanar with the C=C bond. The C(arom.1-C=C bond angles are significantly greater than 120'.

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Étude Structurale Des Stilbènes III. Structures Par Diffraction de Rayons X de Quatre Dérivés E ou Z de L'α, β‐Diphénylacrylate de Méthyle

Tinant

Touillaux

Declercq

et al. 1983

Bulletin des Soc Chimique

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Molecular geometry of the reaction product of ?,?-dinitrostilbene with morpholine

Todres¹,

Kosnikov²,

Dyusengaliev³

et al. 1990

Russ Chem Bull

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Effets de substituants et conformation de stilbenes

Touillaux

Tinant

Meerssche

et al. 1989

Spectrochimica Acta Part A: Molecular Spectroscopy

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Étude Structurale Des Stilbènes I. Structures Par Diffraction de Rayons X de Trois α‐Cyanostilbènes

Abstract: In the three compounds, the phenyl groups are twisted out of the ethylenic bond plane in order to avoid steric hindrance. The C(phenyl1-C=C bond angles are significantly greater than 120" except around C ( 6 ) in I and 111.

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References 13 publications

Étude Structurale Des Stilbènes III. Structures Par Diffraction de Rayons X de Quatre Dérivés E ou Z de L'α, β‐Diphénylacrylate de Méthyle

Étude Structurale Des Stilbènes III. Structures Par Diffraction de Rayons X de Quatre Dérivés E ou Z de L'α, β‐Diphénylacrylate de Méthyle

Molecular geometry of the reaction product of ?,?-dinitrostilbene with morpholine

Effets de substituants et conformation de stilbenes

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