Spectrophotometric Determination and Kinetic Studies of Condensation of Aromatic Aldehydes with 7,9-Dioxo-6,10-dioxaspiro[4.5]decane
作者:H. A. A. Medien、A. A. Zahran、A. W. Erian
DOI:10.1002/jccs.200400022
日期:2004.2
10-dioxaspiro[4.5]decane with aromatic aldehydes in chloroform in the presence of piperidine has been investigated spectrophotometrically at 25-50 °C. The reaction follows overall second order kinetics, first order in each of the reactants and zero order with respect to piperidine. The rate of condensation increases with the presence of electron withdrawing groups on the aromatic ring of the aldehyde. From
用分光光度法研究了 7,9-dioxo-6,10-dioxaspiro[4.5]decane 与芳香醛在哌啶存在下在氯仿中的缩合反应速率,温度为 25-50 °C。该反应遵循总体二级动力学,每个反应物中的一级动力学和关于哌啶的零级动力学。缩合速率随着醛芳环上吸电子基团的存在而增加。根据速率常数对温度的依赖性,计算了活化参数。反应的 ΔH # 与 ΔS # 曲线图给出了一条良好的直线,等速温度为 367.55 K。基于该反应,建议测定浓度范围为 2.65-69.2 μg/mL 的芳香醛。