Crystal structure of 2-(5-methoxy-1-benzofuran-3-yl)acetic acid

Abstract

The benzo­furan residue in the title compound, C11H10O4, is essentially planar (the r.m.s. deviation for the nine non-H atoms = 0.011 Å). While the meth­oxy group is coplanar with the fused ring system [C—C—O—C torsion angle = 3.1 (3)°], the acetic acid residue occupies a position almost prime [C—C—C—C = 77.0 (2)°]. In the crystal, centrosymmetrically related mol­ecules are linked by O—H⋯O hydrogen bonds to form eight-membered {⋯HOCO}2 synthons. The dimeric aggregates assemble into supra­molecular layers in the ab plane via benzene-C—H⋯O(ring) inter­actions.

2-(4,6-Dimethyl-1-benzofuran-3-yl)acetic acid

“…As part of our studies in this area, we now report the crystal structure of the title compound. All the bond lengths and angles are close to those observed for similar structures (Gowda et al, 2015;Ramprasad et al, 2016).…”

2-(6-Methyl-1-benzofuran-3-yl)acetic acid

“…The bond lengths and angles of the title molecules are close to those observed for similar structures, viz. 2-(5-methoxy-1-benzofuran-3-yl)acetic data reports acid (Gowda et al, 2015) and 2-(5-methyl-1-benzofuran-3yl)acetic acid (Ramprasad et al, 2016).…”