Benharref Ahmed, Ourhriss Najia, El Ammari Lahcen, Saadi Mohamed, Berraho Moha
Laboratoire de Chimie des Substances Naturelles, 'Unité Associé au CNRST (URAC16)', Faculté des Sciences Semlalia, BP 2390 Bd My Abdellah, 40000 Marrakech, Morocco.
Acta Crystallogr Sect E Struct Rep Online. 2013 May 22;69(Pt 6):o933-4. doi: 10.1107/S1600536813013457. Print 2013 Jun 1.
The title compound, C17H26Cl2, was synthesized from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzo-cyclo-heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The asymmetric unit contains two independent mol-ecules with similar conformations. Each mol-ecule is built up from fused six- and seven-membered rings and two three-membered rings from the reaction of β-himachalene with di-chloro-carbene. In both mol-ecules, the six-membered ring has a half-chair conformation, whereas the seven-membered ring displays a boat conformation. The absolute configuration was established from anomalous dispersion effects.
标题化合物C17H26Cl2由β-喜马拉雅烯（3,5,5,9-四甲基-2,4a,5,6,7,8-六氢-1H-苯并环庚烯）合成，β-喜马拉雅烯是从阿特拉斯雪松（Cedrus Atlantica）的精油中分离得到的。不对称单元包含两个构象相似的独立分子。每个分子由稠合的六元环和七元环以及β-喜马拉雅烯与二氯卡宾反应生成的两个三元环构成。在两个分子中，六元环呈半椅式构象，而七元环呈船式构象。绝对构型通过反常散射效应确定。
