Abstract
Molecules in the title compound, C 11 H 10 O 4 , occur as centrosymmetric dimers, which lie in parallel planes separated by about 1 A. Both intra- and intermolecular hydrogen bonding occurs across the -OH…O=C groups of the dimer, in a rhombic arrangement. The non-H atoms are effectively planar in each monomeric unit, with the ethyl groups lying in an extended trans configuration. A theoretical study of the equilibrium structures of both the monomeric and dimeric units was made by SCF (self-consistent field) methods with a double-ζ basis set. The monomeric and dimeric structures obtained are very similar to each other, and to the observed structure.
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