Reaction of NN′-dimethylimidazolidine-2-thione with methyl iodide. Kinetic and thermodynamic aspects
作者:Yasuhiko Kondo、Tetsuya Yamada、Shigekazu Kusabayashi
DOI:10.1039/p29810000414
日期:——
The reaction of NN′-dimethylimidazolidine-2-thione with methyl iodide followed simple second-order kinetics in polar solvents, whereas in less polar solvents the reverse process made a significant contribution to the overall rate. The solvent effects on the forward rate constant were linearly correlated with those on the rate of the reaction of tetramethylthiourea with methyl iodide. However, the reactions
的反应NN '-dimethylimidazolidine -2-硫酮与甲基碘,随后在极性溶剂中简单的二阶动力学,而在极性较小的溶剂中的逆过程制成的整体速率的显著贡献。溶剂对正向速率常数的影响与四甲基硫脲与甲基碘的反应速率线性相关。但是,两种1,2,4-三唑-3-硫酮衍生物与甲基碘的反应未显示任何此类相关性。从体积变化和测得的焓变,三个过渡态指数,(Δ 2 V ‡/Δ 2 °),Ñ Ť α在乙腈中确定,并且,约 分别为0.28、0.35和0.43。