Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (3): 20240458.doi: 10.7503/cjcu20240458

• Physical Chemistry • Previous Articles     Next Articles

Theoretical Study of the Effect of Conformational Structures on the Secondary Oxidation Reactions of cis-1,3-Dimethylcyclohexane

SHEN Yuhao, TIAN Zemin(), LI Wei, JI Yixuan, YAN Yingwen   

  1. College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
  • Received:2024-10-09 Online:2025-03-10 Published:2024-11-19
  • Contact: TIAN Zemin E-mail:tzm@nuaa.edu.cn
  • Supported by:
    the Natural Science Foundation of Jiangsu Province, China(BK20200451)

Abstract:

In this study, quantum chemistry method of DLPNO-CCSD(T)/CBS//B3LYP/6-311++G(dp) was applied for low-temperature secondary oxidation reactions of cis-1,3-dimethylcyclohexane, to optimize molecular geometries, compute vibrational frequencies, and refine single point energies of all related reactants, transition states, and products. In this way, the detailed potential energy surfaces for titled reactions were constructed. High pressure limit rate constants of main reaction channels were calculated based on transition state theory. It was shown that side-chain tended to benefit H-transfer channels of hydroperoxy alkylperoxy radicals(OOQOOH), among which 1,5-H transfer reactions proved of great significance, competing with decomposition channel forming keto-hydroperoxides(KHP) and OH radical. Dihydrogen peroxide radicals[P(OOH)2] resulted from H-transfer of OOQOOH radical mainly underwent cyclic ether reactions. The energy barriers of these reactions tended to increase due to side chain. Based on Rice-Ramsperger-Kassel-Marcus/master equation(RRKM/ME) method, the pressure-dependent rate constants were obtained, revealing that the effect of pressure on the rate constants of all above reactions was weak.

Key words: cis-1, 3-Dimethylcyclohexane, Conformational analysis, Secondary oxidation, Hydrogen transfer reaction, Cyclic ether reaction, Rate constant

CLC Number: 

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