8-Desacetoxy-11[beta]H,13-dihydroperoxyferolide, a Sesquiterpene Lactone Hydroperoxide

The [gamma]-lactone of C₁₅H₂₂O₅ has an envelope conformation with the [beta]-carbon at the flap. The hydroperoxy group is disordered with 92% R configuration and 8% S configuration at the chiral center to which it is bonded. The O-O distance for the major configuration is 1.463 (3) Å. Intermolecular hydrogen bonding exists between the hydroperoxy group and the carbonyl oxygen, with the major configuration having an O...O distance of 2.742 (3) Å.

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