5-substituted benzylbarbituric acids has been determined in 50% ethanol/water and they were found to be more acidic than barbituric acid. The pKas of these derivatives obey Hammett's equation indicating that their acidity is affected by substituents in the same manner as the benzoic acid ionization constants. A synthesis of these acids is described.
已在50%的
乙醇/
水中测定了
5-苄基巴比妥酸和一系列5-取代的苄基
巴比妥酸的酸度,发现它们比
巴比妥酸更酸性。这些衍
生物的p K a s服从哈米特方程,表明它们的酸度受取代基影响的方式与
苯甲酸电离常数相同。描述了这些酸的合成。