Hydrogen Bonding and Ring Asymmetry in (±)-cis-2-Phenylcyclopropanecarboxylic Acid

The title compound, (±)-cis-2-Phenylcyclopropanecarboxylic acid, C₁₀H₁₀O₂, crystallized in the centrosymmetric space group P2₁/n. The hydrogen bonding is of the cyclic dimer type about a center of symmetry; the O_donor...O_acceptor distance is 2.645 (2) Å. The carboxylic H atom is ordered, as are the O atoms. The cyclopropane ring is asymmetric; the values found for the asymmetry parameters are δ(COOH) = −0.045 (4) Å and δ(phenyl) = −0.027 (4) Å.

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