5,8-DIMETHOXY-1-NAPHTHOIC ACID AND METHYL 5,8-DIMETHOXY-1-NAPHTHOATE

In 5,8-dimethoxy-1-naphthoic acid, C13H12O4, hydrogen bonding is of th e cyclic dimer type. The acid H atom is modelled as being distributed equally over two sites. In addition to the conventional hydrogen bonds , there are three significantly attractive C-H . . . O interactions. T he dihedral angle between the naphthalene core plane and the carboxyl plane is 80.0 (1)degrees. In methyl 5,8-dimethoxy-1-naphthoate, C14H14 O4, there are no conventional hydrogen bonds but there are three signi ficantly attractive C-H . . . O interactions. With the exception of th e C-O distances in the carboxyl groups, the molecular geometries of th e acid and the ester are quite similar.