Nucleophilic Substitution Reactions of Meta- and Para-Substituted Benzylamines with Benzyl Bromide in Methanol Medium
作者:R. RAVI、R. SANJEEV、V. JAGANNADHAM、ADAM A. SKELTON
DOI:10.1002/kin.20890
日期:2015.1
The rates of reactions of para‐ and meta‐substituted benzylamines with benzyl bromide were measured using conductivity technique in methanol medium. The reaction followed a total second‐order path. The end product of the reaction is identified as dibenzylamine (X‐C6H4CH2NHCH2C6H5) (where X = 4‐OCH3, 4‐CH3, H, 4‐Cl, 4‐CF3, 3‐CF3, 4‐NO2). Electron‐withdrawing groups such as chloro, trifluoromethyl, and
使用甲醇介质中的电导率技术测量对位和间位取代的苄胺与苄基溴的反应速率。反应遵循总的二级路径。该反应的最终产物被鉴定为二苄胺(X-C 6 H 4 CH 2 NHCH 2 C 6 H 5)(其中X = 4-OCH 3,4 -CH 3,H,4-Cl,4-CF 3,3‐CF 3,4 ‐NO 2)。与未取代的化合物相比,苄胺部分中的吸电子基团(例如氯,三氟甲基和硝基)降低了反应速率,而供电子基团(例如甲氧基和甲基)则提高了反应速率。提出了一种涉及在胺亲核试剂和苄基溴之间形成S N 2型过渡态并随后分解的机制。反应的哈米特反应常数ρ随着温度的升高而降低。计算并讨论了激活参数。