Crystal structure of racemic trans-π-camphanic acid, 1α,5β-dimethyl-2-oxo-3-oxabicyclo[3,3,0]octane-6β-carboxylic acid, a γ-lactone of rare type

Abstract

X-Ray analysis has confirmed that the title compound contains a γ-lactone trans-fused to a cyclopentane ring and shows that both five-membered rings adopt the half-chair conformation such that the conformation in one ring is the mirror image of that in the other.