覆盆子酮中间体合成过程的动力学研究

摘要

用紫外分光光度法跟踪测定了用氢氧化钠溶液催化对羟基苯甲醛与丙酮合成覆盆子酮中间体(对羟基苯基-3-丁烯-2-酮)的反应过程.结果表明,在实验条件范围内,覆盆子酮中间体的合成反应呈现二级反应,对对羟基苯甲醛和丙酮均表现为一级,活化能Ea=24.831 kJ/mol,指前因子A=90.423 L/(mol·min),动力学方程为r=-dCA/dt=90.423 e-24831/RTCACB.该研究并对动力学方程进行了验证,结果表明动力学方程的置信度较高.%The crossed-aldol condensation of 4-hydroxybenzaldehyde with acetone gives an adduct information on 4-(4' -hydroxyphenyl)-3-buten-2-one, which is the intermediates of raspberry ketone (rheos-min). The kinetics of this reaction was studied under the optimized experimental conditions and the reaction process was tracked with UV spectrophotometry analysis method. The results showed that this condensation was a second-order reaction, with Ea =24.831 kJ/mol,A =90.423 L/(mol·Min) .dynamic equa-tion r=- dCA/dt=90.423 e-24 831/RT CA CB.The dynamic equation was verified,and the results showed that the dynamic equation of confidence was well.