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Ethyl 1-(4-meth-oxy-benz-yl)-3-p-tolyl-1H-pyrazole-5-carboxyl-ate

Chuan-Xing Shi1, Yun-Man Xie

  • 1Henan Chemical Industry Research Institute Co. Ltd, Zheng Zhou 450052, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|July 15, 2011
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.
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