(o-Hydroxyphenyl)methylphosphonic acids are readily obtained from o-(bromomethyl)- or o-(hydroxymethyl)phenols and trialkyl phosphites. Subsequent hydrolysis leads to the corresponding phosphonic acids. For a series of such compounds, the pKavalues have been determined by potentiometry. Their dependence on additional substituents in the aromatic ring is discussed in terms of electronic and steric
从邻-(溴甲基)-或邻-(羟甲基)酚和亚磷酸三烷基酯容易获得(邻-羟基苯基)甲基膦酸。随后的水解产生相应的膦酸。对于一系列此类化合物,p K a值已通过电位计确定。根据电子和空间效应,讨论了它们对芳环中其他取代基的依赖性。
81. The action of alkalis upon substituted benzdioxins