Identification of isomeric di- and poly-nitrobiphenyls by mass spectrometry

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Abstract
On electron impact retention of positional identity occurs in the molecular ions of dinitrobiphenyls. This results in predictable differences between the spectra of the isomers and enables these compounds to be distinguished from one another. It is shown that the predictions as to the fragmentation sequences of dinitrobiphenyls can be extended to polynitrobiphenyls. Similarities have been found between the behaviour of a nitro-group and a carboxylic acid group in 2-substituted biphenyls and it is suggested that both functions are capable of effecting radical substitution into the adjacent aromatic ring.

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