作者:Donald F. Mullica、Kevin G. Pinney、Koren M. Dingeman、Ashley D. Bounds、Eric L. Sappenfield
DOI:10.1007/bf01670312
日期:1996.12
The crystal and molecular structures of two methoxybenzoI[b]thiophenes have been determined by three-dimensional, single-crystal X-ray diffractometry. Both 3-(4'-hydroxy-3',5'-dimethoxybenzoyl)-2-(4' -methoxyphenyl)-6-methoxybenzo[b]thiophene and 3-(2',6'-dimethoxybenzoyl)-2-(4'-methoxyphenyl)-6-methoxybenzoyl (hereafter referred to as I and II, respectively) crystallize in the monoclinic centrosymmetric space group P2(1)/n (No. 14, C-2h(5)) with four formula units-per cell with a = 6.866(1), b = 28.638(2), c = 11.830(2) Angstrom, and beta 105.52(1)degrees and a = 9.328(1), b = 7.977(1), c = 29.650(4) Angstrom, and beta = 97.87(1)degrees, respectively. The phase problems were solved by direct methods and the respective final full-matrix least-squares refinements converged to R = 0.046 and 0.031. The structures differ in the positioning of the dimethoxy groups of the benzoyl ligands and the addition of a hydroxyl group in I. The molecules in the crystal lattice are held together by van der Waals forces plus the addition of hydrogen bonding in compound I. Selected bond distances and angles and torsion angles are tabularized.