dimethoxy derivatives (5-10) in various solvents dissolved were collected. The keto-enol tautomerism equilibrium constant was calculated with (1)H NMR. The position of the methoxy group in 1,3-diphenylpropane-1,3-dione was shown to have an influence on the molecule's UV absorption spectrum and the keto-enol tautomerism equilibrium constant. The methoxy group in the para position increases the absorption
收集1,3-二苯基
丙烷-1,3-二酮(1),其三种甲氧基衍
生物(2-4)和其六种二甲氧基衍
生物(5-10)在各种溶解溶剂中的紫外吸收光谱。酮-烯醇互变异构平衡常数通过(1)1 H NMR计算。
1,3-二苯丙烷-1,3-二酮中甲氧基的位置显示出对分子的紫外线吸收光谱和酮-烯醇互变异构平衡常数的影响。对位的甲氧基增加了UV-A范围内辐射的吸收。在邻位具有甲氧基的化合物经历在酮-烯醇互变异构平衡中向酮形式的转变。当存在两个甲氧基时,它们位置的影响是累积的。