Nucleophilic substitution reactions of anilino thioethers with anilines in methanol
作者:Huck Keun Oh、Jin Hee Yang、Hai Whang Lee、Ikchoon Lee
DOI:10.1039/a909541a
日期:——
state with high ρX (βX) and ρZ (βZ) values. However, cross interactions between the nucleophile and leaving group are extensive with large negative constants (ρXZ=−1.7, βXZ=−0.27), which are suggestive of an SN2 reaction with frontside attack. The inverse secondary kinetic isotope effects involving deuterated anilines (kH/kD=0.84–0.88) along with low ΔH≠ (4.2–5.2 kcal mol−1) and ΔS≠ (−46–−59 e.u.) values
已经对苯胺硫醚,N-甲基-N -[[(Z-苯硫基)甲基] -Y-苯胺,YC 6 H 4 N(CH 3)CH 2 SC 6 H的苯胺的溶剂分解和氨解反应进行了动力学研究。 4 Z,I在45.0°C的甲醇中。与在水中产生大量寿命的亚胺阳离子相反,溶剂分解是通过在甲醇中的直接置换(S N 2)机理进行的。在氨解,无论键的形成和裂解的井下,在后期小号方式Ñ具有高2过渡状态ρ X(β X)和ρ Ž(β Ž)值。然而,亲核试剂和离去基团之间的交叉相互作用广泛与大的负常数(ρ XZ = -1.7,β XZ = -0.27),这是暗示一个S的Ñ与前侧攻击2反应。氘代苯胺(k H / k D = 0.84-0.88)以及较低的ΔH ≠ (4.2-5.2 kcal mol -1)和ΔS ≠(-46--59 eu)值的逆次要动力学同位素效应是一致的提出的机制。