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Identification and differentiation of isomeric methylated derivatives of oxygenation products of polycyclic aromatic hydrocarbons by gas chromatography-mass spectrometry
Mascarella, S., Patel, J., Griffin, G., & Laseter, J. (1979). Identification and differentiation of isomeric methylated derivatives of oxygenation products of polycyclic aromatic hydrocarbons by gas chromatography-mass spectrometry. Analytical Letters, 12(B11), 1179-88.
An isomeric pair of compds. is obtained from 4-carboxyaldehydephenanthrene-5-carboxylic acid by various methods routinely applied for the methylation of acidic oxygenation products of K-region polycyclic arom. hydrocarbons (PAH's) prior to gas chromatog. and gas chromatog.-mass spectrometric anal. Differentiation of the individual cyclic and acyclic isomers, a classical general problem, proves possible by careful anal. of the mass spectral fragmentation patterns in the representative case studied here.
