Abstract
The reaction of 7-benzyloxy-6,2′,3′,4′-tetramethoxyisoflavylium perchlorate with 1-(2,4-dimethoxyphenyl)-3-(3,4-dimethoxyphenyl)-prop-l-ene and of 6,7,2′,3′,4′-pentamethoxyisoflavylium perchlorate with the same propene yielded respectively 7-benzyloxy-6,2′,3′,4′-tetramethoxyisoflav-3-ene (5) and 2,6,7,2′,3′,4′-hexamethoxyisoflav-3-ene (7) whose structures have been established by X-ray crystallography. Crystals of (5) are monoclinic, space groupP21/a (No. 14) with four molecules in a unit cell of dimensionsa=8.528(2),b=13.294(3),c=19.629(4) Å,β=99.92(2)°. Crystals of (7) are also monoclinic, space groupC2/c (No. 15) with eight molecules in a unit cell of dimensionsa=28.088(3),b=10.662(3),c=12.869(1) Å,β=97.32(1)°. Both structures were solved by direct methods and refined by full-matrix least-squares calculations to finalR values of 0.053 and 0.041 for 1673 and 1424 observed data for (5) and (7) respectively. The molecular dimensions are in accord with accepted values.
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For Part 14 see Whalley, W. B., Ferguson, G., and Khan, M. A., (1980)J. Chem. Res. (M), 2219.
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Afonya, T.C.A., Epelle, F.B.M., Whalley, W.B. et al. The chemistry of the “insoluble red woods.” Part 15. The crystal structures of 7-benzyloxy-6,2′,3′,4′-tetramethoxy- and 2,6,7,2′,3′,4′-hexamethoxy-isoflav-3-ene. Journal of Crystallographic and Spectroscopic Research 15, 289–299 (1985). https://doi.org/10.1007/BF01160489
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DOI: https://doi.org/10.1007/BF01160489