The mass spectra of the phenylhydrazones and 2,4‐dinitrophenylhydrazones of ortho substituted benzaldehydes and acetophenones (X = I, Br, Cl, OCH3, OH) show characteristic [M − X]+ ions which allow the ortho derivatives to be distinguished from their meta and para isomers.
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Cable et al. (1972) studied this question.
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