1-苯基-3-甲基-4-芳亚甲基吡唑-5-酮的紫外光谱的取代基效应

THE SUBSTITUENT EFFECT ON UV SPECTRA OF 1-PHENYL-3-METHYL-4-ARYLIDENEPYRAZOL-5-ONES

在 KF Al2 O3负载型固体碱催化下 ,1苯基 3甲基吡唑 5酮和对位不同取代基芳香醛进行缩合反应 ,合成了 1苯基 3甲基 4芳亚甲基吡唑 5酮 ,测定了 6个产物在 1 5种溶剂中的紫外光谱 ,其最大吸收频率与 Hammett取代基常数之间存在良好的线性关系 .

In the presence of the solid base catalyst KFAl 2O 3, 1phenyl3methylpyrazol5 one reacts with the aromatic aldehydes in refluxing methanol to give 1phenyl3methyl4arylidenepyrazol5ones in moderate yield. The UV spectra of six products in fifteen solvents are recorded and their maximum absorption frequency of the UV spectra correlates finely with the Hammett's substituent coefficients.