Kinetics and mechanism of the reaction of S,S-diphenylsulfilimine with a series of aryl halides
作者:John P. B. Sandall、Claire Thompson、Nicholas J. D. Steel
DOI:10.1039/a606313f
日期:——
The stoichiometry, rate constants and order of reaction
have been determined for the reaction of
S,S-diphenylsulfilimine with the substrates
1-fluoro-2,4-dinitrobenzene, 1-chloro-2,4-dinitrobenzene,
2-chloro-3-nitropyridine, 2-chloro-5-nitropyridine and
2-chloro-3,5-dinitropyridine. Arrhenius parameters and solvent
effects have also been determined for some of these reactions.
The results demonstrate that the reaction is a typical
nucleophilic aromatic substitution process with no measurable
base catalysis. A high reactivity of the sulfilimine reagent is
observed and accounted for in terms of the contribution of the
ylid form to the overall structure.
测定了 S,S-二苯基亚磺酰亚胺与底物 1-氟-2,4-二硝基苯、1-氯-2,4-二硝基苯、2-氯-3-硝基吡啶、2-氯-5-硝基吡啶和 2-氯-3,5-二硝基吡啶反应的化学计量、速率常数和反应顺序。结果表明,该反应是一个典型的亲核芳香取代过程,没有可测量的碱催化作用。硫代亚胺试剂具有很高的反应活性,并可通过酰基形式对整体结构的贡献进行解释。