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Triterpenes from Stachyurus himalaicus var. himalaicus Hook. f. et Thoms. ex Benth

Yun-Song Wang1, Rong Huang, Ning-Zhong Li

  • 1Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, China. wangys@ynu.edu.cn

Molecules (Basel, Switzerland)
|April 30, 2010
PubMed

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...