title: (1S,3R,8R,9R,10S)-2,2-Dibromo-3,7,7,10-tetra-methyl-9β,10β-ep-oxy-3,7,7,10-tetra-methyl-tricyclo-[6.4.0.0(1,3)]dodeca-ne.
abstract: The title compound, C16H24Br2O, was synthesized from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzocyclo-heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus atlantica). The mol-ecule contains fused six- and seven-membered rings, each linked to a three-membered ring. The six-membered ring has a half-chair conformation, while the seven-membered ring displays a chair conformation. The dihedral angle between the mean planes through the six- and seven-membered rings is 39.55 (12)°. The two three-membered rings, linked to the six- and seven-membered rings, are nearly perpendicular to the six-membered ring, making dihedral angles of 78.6 (2) and 80.5 (2)°, respectively. The absolute structure was established unambiguously from anomalous dispersion effects. In the crystal, each mol-ecule is linked to its symmetry-equivalent partner by C-H⋯O hydrogen bonds, forming zigzag chains parallel to [100].
authors: Laboratoire de Chimie Biomoléculaire, Substances Naturelles et Réactivité "Unité Associée au CNRST (URAC16)", Faculté des Sciences Semlalia, BP 2390, Bd My Abdellah, 40000 Marrakech, Morocco.
authors: Abdelouahd
authors: A
authors: Oukhrib
authors: Ahmed
authors: A
authors: Benharref
authors: Mohamed
authors: M
authors: Saadi
authors: Moha
authors: M
authors: Berraho
authors: Lahcen
authors: L
authors: El Ammari
references: Pest Manag Sci. 2004 Sep;60(9):927-32
references: 15382508
references: J Org Chem. 2000 Jul 14;65(14):4431-4
references: 10891148
references: Acta Crystallogr D Biol Crystallogr. 2009 Feb;65(Pt 2):148-55
references: 19171970
references: Acta Crystallogr C. 2002 Aug;58(Pt 8):o518-20
references: 12154317
references: Acta Crystallogr Sect E Struct Rep Online. 2010 Nov 10;66(Pt 12):o3125
references: 21589429
references: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references: 18156677