(4R)-3-Hydroxy-7-isopropyl-4-methyl-5,6-dihydrobenzofuran-2(4H)-one

Abstract

In the title compound, alternatively called α-hy­droxy-γ-alkyl­idenebutenolide, C12H16O3, two independent mol­ecules (A and B) crystallize in the asymmetric unit in each of which the 5,6-di­hydro­benzo ring has an envelope conformation. The torsion angle along the butadiene chain in the γ-alkyl­idenebutenolide core is −177.9 (2)° for mol­ecule A and 179.9 (2)° for mol­ecule B. In the crystal, O—H⋯O hydrogen bonds between hy­droxyl and carbonyl groups of adjacent independent mol­ecules form dimers with R 2 2(10) loops.