Method and reagent for converting a carboxylic acid to a positively charge amide are described. The method and reagent facilitate positive ion mass spectral analysis of carboxylic acids. The method includes reacting a carboxylic acid with a compound having formula I:
wherein A and B are aromatic rings, ring A includes a quaternized nitrogen and has n additional ring atoms, each additional ring atom optionally substituted with an RA group, and n is an integer from 4 to 10, and ring B includes a carbon atom and has m additional ring atoms, each additional ring atom optionally substituted with an RB group, and m is an integer from 4 to 10. The compound includes at least one RA or RB group, and the at least one RA and RB group is -L-N(Z)H; and X− is a counterion.
描述了将
羧酸转化为带正电荷的酰胺的方法和试剂。该方法和试剂有助于对
羧酸进行正离子质谱分析。该方法包括将
羧酸与具有以下式I的化合物反应:其中A和B为芳香环,环A包括一个季
铵氮,并且具有n个额外的环原子,每个额外的环原子可选择地被RA基取代,n为4至10之间的整数,环B包括一个碳原子,并具有m个额外的环原子,每个额外的环原子可选择地被RB基取代,m为4至10之间的整数。该化合物包括至少一个RA或RB基,至少一个RA和RB基为-L-N(Z)H;X-为一个对离子。