Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (3): 403.doi: 10.7503/cjcu20160717

• Organic Chemistry • Previous Articles     Next Articles

Synthesis and Crystal Structure of Trans-3-phenyl-12-substituted Cyclododecanone

YANG Mingyan, ZHANG Li, WANG Daoquan, WANG Ming an*()   

  1. Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
  • Received:2016-10-14 Online:2017-03-10 Published:2017-01-23
  • Contact: WANG Ming an E-mail:wangma@cau.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21172254).

Abstract:

2-Cyclododecenone was prepared via oxidation of cyclododecanone with o-iodylbenzoic acid(IBX), then 3-phenyl cyclododecanone was synthesized by 2-cyclododecenone and phenyl boronic acid under catalysis of palladium acetate. A series of 3-phenyl-12-substitutedcyclododecanone was regioselectively prepared by the reaction of 3-phenylcyclododecanone with different reagents, and their structures were characterized by 1H NMR, 13C NMR and HR-MS. The crystals for four compounds were obtained in the solution and X-ray diffraction analyses were carried out. The results showed that [3333]-2-one conformation was took by the cyclododecanone ring of 3-phenyl-12-substituted cyclododecanone with trans-configuration of two substituted groups. One case was that the two substituted groups were at the same side, phenyl was at β-corner-anti position of the carbon atom in one side of carbonyl, and the other groups were at α-corner-syn position of the carbon atom in the other side of carbonyl in their crystals. The other case was that the two substituted groups were at the different sides, both phenyl and the other groups were at side-exo position of the carbon atoms in two sides of carbonyl in their crystals. The results of quantum mechanics calculation were consistent with those of X-ray diffraction.

Key words: 3-Phenylcyclododecanone, 3-Phenyl-12-substitutedcyclododecanone, [3333]-2-One conformation, Conformation analysis

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