Hydrogen Bonding and Ring Asymmetry in a Substituted Cyclopropane: (+)-trans-(1S,2S)-2-Phenylcyclopropanecarboxylic Acid at 208K

The title compound, C₁₀H₁₀O₂, crystallized in space group P2₁ with two molecules in the asymmetric unit. In this structure, hydrogen bonding of the cyclic dimer type [with O...O 2.623 (2)–2.637 (2) Å] links the two molecules of the asymmetric unit. The two carboxylic H atoms are ordered, as are the O atoms. Each of the two nonequivalent molecules exhibits an asymmetric cyclopropane ring; the values found for the asymmetry parameters are δ(COOH) = −0.034 and −0.025 Å, and δ(phenyl) = −0.028 and −0.023 Å.

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