Abstract The constants of acid-base equilibrium of 6-methyluracil-5-carbonitrile in water were determined spectrophotometrically. For the first time, 1,6-dimethyluracil-5-carbonitrile and 3,6-dimethyluracil-5-carbonitrile were obtained, their structures were proved by 1H, 13C, and 15N NMR spectroscopy. Based on the pKa values obtained for all three compounds, the sequence of dissociation in the 6-
摘要 分光光度法测定了6-甲基尿
嘧啶-5-甲腈在
水中的酸碱平衡常数。首次获得了1,6-二甲基尿
嘧啶-5-甲腈和
3,6-二甲基尿
嘧啶-5-甲腈,并通过1 H、13 C和15 N NMR光谱证明了它们的结构。基于对所有三种化合物获得的 p K a值,确定了 6-甲基尿
嘧啶-5-甲腈分子在碱性
水溶液中的解离顺序。