Specific salt effects on the hydrolysis reaction rate of tropolone tosylate in binary MeCN–H2O media containing n-Bu4NOH
作者:Leta Danno Bayissa、Masashi Hojo
DOI:10.1016/j.molliq.2015.12.044
日期:2016.3
reaction. All the salts of NaN3, Et4NCl, and Et4NBr appear to increase the log (k/s− 1) value in the order of Et4NCl–Et4NBr < NaN3. The Arrhenius plots of the hydrolysis in the 50% (v/v) MeCN–H2O binary media containing 2.0 mmol dm− 3 n-Bu4NOH in the presence of various kinds of salts have been evaluated. All the salt systems have given a good linearity from 35 to 60 °C with the activation energy (Ea)
已经在50°C下在含有n -Bu 4 NOH的20–90%(v / v)MeCN–H 2 O二元介质中研究了托酚酮甲苯磺酸酯的水解反应速率。n -Bu 4 NOH浓度的增加引起水解速率的增加。随着MeCN含量的增加,已经观察到两种不同的影响,即速率降低和高达60%(v / v)的MeCN的连续增加以及MeCN比例的进一步增加。在恒定的n -Bu 4 NOH浓度下,添加的盐(0.0–1.0 mol dm -3)对“伪”一级速率常数[log(k / s-1)]。在碱金属和碱土金属的高氯酸盐中,NaClO 4和Ba(ClO 4)2引起明显的速率加速,特别是在较高MeCN比例的介质中。然而,LiClO 4和Ca(ClO 4)2引起速率减速,而Mg(ClO 4)2导致水解反应的完全抑制。NaN 3,Et 4 NCl和Et 4 NBr的所有盐似乎都按Et 4 NCl–Et 4的顺序增加log(k / s