5-取代苯亚甲基乙内酰脲的紫外光谱及其取代基效应

THE SUBSTITUENT EFFECT ON UV SPECTRA OF 5-ARYLIDENEHYDANTOIN

在 KF Al2 O3 负载型固体碱催化下 ,乙内酰脲和芳香醛发生缩合反应 ,中等产率 ( 5 0 .2 %～6 5 .5 % )地合成了 5取代苯亚甲基乙内酰脲 ,测定了 6个产物在 1 6种溶剂中的紫外光谱 ,其最大吸收频率与

In the presence of the solid base catalyst KFAl 2O 3, hydantoin condensates with aromatic aldehydes in DMF to give 5arylidenehydantoin in high yields(50.2%～65.5%). The maximum absorption frequency of the ultraviolet spectra in sixteen organic solvents correlate finely with the Hammett′s substituent cofficients.