C19H22O4, monoclinic, P21/c, a = 2·515 (2), b = 17·472 (3), c = 7·489 (1) Å, β = 00·40 (1)°. The structure was solved by direct methods. The cyclohexyl group is pseudo-equatorial and trans to the axial hydroxyl; the dihydropyran ring is a half-chair distorted towards the d,e-diplanar conformation. Hydrogen bonding between the coumarin carbonyl and the hydroxyl groups at an O···O distance of 2·834 (4) Å is found. In CDC13 solution, this compound exists predominantly in the open-chain keto form.
Conformation; Molecular structure
Citation: Pilot Scholars Version (Modified MLA Style)
Valente, Edward J. and Hodgson, Derek J., "Structure of 4-Cyclohexyl-3,4-dihydro-2-hydroxy-2-methyl-2H,5H-pyrano[ 3,2-c]benzopyran-5-one" (1979). Chemistry Faculty Publications and Presentations. 13.