The mass spectra are given of nonanoic, 2-ethylheptanoic, 2,5-diethylhexanedioic, 2-ethyloctanedioic, and decanedioic acids with the methyl esters of these acids. Quantitative methods are described for the analysis of nonanoic and 2-ethylheptanoic acid mixtures as well as mixtures of the respective methyl esters. Data are given for the precision and accuracy of the methods. By using a diazomethane esterification procedure, the C-9 monobasic and C-10 dibasic acids were quantitatively converted to their methyl esters.
Fred M. Trent, Franklyn D. Miller, and Glenn H. Brown, "Mass Spectrometry of Some High Molecular Weight Aliphatic Acids and Their Methyl Esters. Analysis of Nonanoic and 2-Ethylheptanoic Acid Mixtures," Appl. Spectrosc. 15, 64-67 (1961)