Kinetics and mechanism of the reaction of substituted phenylhydrazones with thallium(III) acetate. Reactions of mercury(II) acetate with nitrogen compounds. Part 8
作者:Richard N. Butler、Gerard J. Morris、Anne M. O'Donohue
DOI:10.1039/p29810001243
日期:——
The reaction of substituted phenylhydrazones with thallium(III) acetate in acetic acid involved an electrophilic attack at the hydrazone amino-NH moiety giving an intermediate which is attacked by solvent at the methine carbon. The Hammett ρ values for substituents in the methine and the N-phenyl rings were –1.05 and –3.6, respectively. Activation thermodynamic parameters ΔEa 17.9, ΔHa 17.2 kcal mol–1
取代的苯hydr与乙酸th(III)在乙酸中的反应在氨基-NH部分发生亲电攻击,从而制得中间体,该中间体在次甲基碳上被溶剂攻击。次甲基和N-苯基环中取代基的哈米特ρ值分别为–1.05和–3.6。活化热力学参数Δ Ë一个17.9,Δ ħ一个17.2千卡摩尔-1,Δ小号一个-14.65 CALķ -1摩尔-1测量了p氯苯甲醛p-硝基苯hydr。芳族醛芳基hydr的主要产物是N'-乙酰基-N-芳酰基-N'-芳基肼(5)。酮芳基hydr的主要产物是酮的α-乙酰氧基-α-苯基偶氮衍生物(4)。讨论了苯hydr与Hg II,TI III和Pb IV的乙酸酯的反应性出乎意料的差异。