Concurrent pathways to explain solvent and substituent effects for solvolyses of benzoyl chlorides in ethanol-trifluoroethanol mixtures
作者:T. William Bentley、In Sun Koo
DOI:10.3998/ark.5550190.0013.703
日期:——
Rate constants are reported at 25 oC for solvolyses of p-Z-substituted benzoyl chlorides (Z = O2N, Cl, H, Me, and MeO) in 2,2,2-trifluoroethanol (TFE) in binary mixtures with water or ethanol. Product selectivities (kTFE/kwater) are also reported. Previous work in which rate constants for solvolyses of benzoyl chlorides are correlated with σ constants is re-evaluated. V-shaped plots (assuming concurrent
pZ 取代的苯甲酰氯(Z = O2N、Cl、H、Me 和 MeO)在 2,2,2-三氟乙醇 (TFE) 与水或乙醇的二元混合物中的溶剂解反应速率常数报告为 25 oC。还报告了产品选择性(kTFE/kwater)。以前的工作是重新评估苯甲酰氯溶剂分解的速率常数与 σ 常数相关的工作。V 形图(假设同时发生反应)由速率常数与 σ(不是 σ)的对数构成,用于取代效应或溶剂效应的合适参数。建立条件,预测并发机制(一种解离,一种结合)各自对观察到的速率常数贡献 50%。