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• W4387253053 abstract "Abstract Computational studies to determine the rate constants and thermodynamic properties of the nucleophilic aromatic substitution reactions of 4‐R‐1‐chloro‐2,6‐dinitrobenzenes 1 , 6‐R‐1‐chloro‐2,4‐dinitrobenzenes 2 and some of the corresponding 1‐phenoxy derivatives 3 and 4 with aniline in the gas phase, acetonitrile and toluene is reported at the M06‐2x/6‐31g+(d,p) level of theory; R=H, NO 2 , CF 3 , CN and ring N. Formation of the Meisenheimer complex intermediate was observed in all cases and its stability was dependent on the number of electron‐withdrawing groups present on the ring and their relative position. The overall reaction was found to be exothermic and exergonic in all cases. From kinetics calculations, the initial attack of the aniline nucleophile on the dinitrobenzene to form the intermediate is rate limiting with the chloride ion as the leaving group in acetonitrile and decomposition of the MC was rate limiting in vacuum and toluene. With the phenoxide ion as the leaving group, the decomposition of the MC intermediate is rate limiting in all cases. The observation of MC and thermodynamic data obtained are suggestive of the prevalence of a multistep S N Ar mechanism and ring activation by electron withdrawing group increased the rate of reaction." @default.
• W4387253053 created "2023-10-03" @default.
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• W4387253053 date "2023-10-02" @default.
• W4387253053 modified "2023-10-18" @default.
• W4387253053 title "DFT Study of the S_NAr Reactions of 1‐Chloro‐2‐nitro‐ and 1‐Phenoxy‐2‐nitro‐benzenes with Aniline in Acetonitrile and Toluene: Concerted or Multistep Mechanism?" @default.
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• W4387253053 doi "https://doi.org/10.1002/slct.202204480" @default.
• W4387253053 hasPublicationYear "2023" @default.
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