METHYL 2-(2,6-DIMETHOXYPHENYL)BENZOFURAN-4-CARBOXYLATE

C18H16O5, M(r) = 312.3, orthorhombic, Pbca, a = 11.4064 (7), b = 13.098 (2), c = 20.848 (2) angstrom, V = 3114.8 (6) angstrom 3, Z = 8, D(x) = 1.332 g cm-3 at 293 K, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 7.68 cm-1, F(000) = 1312, 3203 unique data measured, final R = 0.040 for 2738 reflections with I > 3.0-sigma(I). Maximum deviation from planarity of the ring containing the two methoxyl substituents is 0.004 (2) angstrom, and the maximum deviation from planarity of the benzofuran is 0.0259 (12) angstrom. The dihedral angle formed between the benzofuran and the ring bearing the two methoxyl groups is 62.39 (3)-degrees. Both of the methoxyl substituents are nearly coplanar with the ring, and anti to the benzofuran. The torsional deviations are 2.3 (2)-degrees for the methoxyl group nearest the benzofuran oxygen and 5.8 (2)-degrees for the other. The ester substituent is nearly coplanar with the benzofuran ring system with a torsional deviation of 9.8 (2)-degrees for the carbonyl oxygen. The C = C double-bond distance is 1.340 (2) angstrom.