The gamma-lactone of C15H22O5 has an envelope conformation with the be
ta-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) An
gstrom. 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) Angstrom.