作者:Vincenzo Frenna、Nicol� Vivona、Giovanni Consiglio、Domenico Spinelli
DOI:10.1039/p29850001865
日期:——
formation with 2,4-dinitrophenol in benzene (KB), and the pKa, values in water, of thirty-three amines have been measured. According to the class of amine, two different situations can be observed: for primary amines and secondary cyclic amines, the effects of structural variations on basicity are higher in water than in benzene; on the other hand, for tertiary amines these effects are similar in the
已经测量了与苯中的2,4-二硝基苯酚形成离子对的常数(K B),以及33种胺在水中的p K a值。根据胺的种类,可以观察到两种不同的情况:对于伯胺和仲环胺,结构变化对碱度的影响在水中要比在苯中高。另一方面,对于叔胺,这两种溶剂的作用相似。K B,伯胺的值与σ*具有良好的相关性。塔夫脱(Taft)和汉考克(Hancock)方程可统一处理各种胺类的K B值。