Burrett, S.Taylor, D.Tiekink, E.2015-03-232015-03-232014Acta Crystallographica Section E: Structure Reports Online, 2014; 70(7):776-7771600-53681600-5368http://hdl.handle.net/2440/90104Includes 18 pages of supporting information, pp. sup. 1-sup.18Four independent mol-ecules (A-D) comprise the asymmetric unit of the title compound, C15H26O2, which differ only in the relative orientations of the terminal -C(Me)2OH groups [e.g. the range of Cmethyl-ene-Cmethine-Cquaternary-Ohy-droxy torsion angles is 52.7 (7)-57.1 (6)°, where the Cmethyl-ene atom is bound to an epoxide C atom]. The five-membered rings adopt envelope conformations, with the methyl-ene C atom adjacent to the methine C atom being the flap atom in each case. In each mol-ecule, the conformation of the seven-membered ring is a half-chair, with the Cmethyl-ene-Cmethine bond, flanked by methyl-ene C atoms, being the back of the chair. Supra-molecular helical chains along the b axis are found in the crystal packing, sustained by hy-droxy-epoxide O-H⋯O hydrogen bonding. Mol-ecules of A self-associate into a chain as do those of D. A third independent chain comprising B and C mol-ecules is also formed. The studied crystal is a pseudo-merohedral twin (minor component ca 21%).enCopyright © International Union of CrystallographyJournal article003001018110.1107/S16005368140135432-s2.0-8490417153484024Taylor, D. [0000-0002-3302-4610] [0000-0002-4274-3983] [0000-0003-0633-7424]