Acta Crystallographica Section C

Volume 65, Part 7 (July 2009)

organic compounds

 

1,2,3-Trimethoxy-4-[(E)-2-phenylvinyl]benzene and (E,E)-1,4-bis(2,3,4-trimethoxyphenyl)buta-1,3-diene

J. Sopková-de Oliveira Santos, M.-A. Bazin, J.-F. Lohier, L. El Kihel and S. Rault

Abstract: The stilbene derivative 1,2,3-trimethoxy-4-[(E)-2-phenylvinyl]benzene, C₁₇H₁₈O₃, (I), and its homocoupling co-product (E,E)-1,4-bis(2,3,4-trimethoxyphenyl)buta-1,3-diene, C₂₂H₂₆O₆, (II), both have double bonds in trans conformations in their conjugated linkages. In the structure of stilbene (I), the aromatic rings deviate significantly from coplanarity, in contrast with coproduct (II), the core of which is rigorously planar. The deviation in stilbene (I) seems to be driven by intermolecular electrostatic interactions. Diene (II) sits on a crystallographic inversion centre, which bisects the conjugated linkage.

Formula: C₁₇H₁₈O₃ and C₂₂H₂₆O₆

	Structure factor file (CIF format) (312.9 kbytes) [ doi:10.1107/S0108270109019702/fa3186Isup2.hkl ] Contains datablock I
	Structure factor file (CIF format) (212.3 kbytes) [ doi:10.1107/S0108270109019702/fa3186IIsup3.hkl ] Contains datablock II

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