Abstract

Nitrophenylhydrazones, notably 2,4-dinitrophenyl-hydrazones (2,4-DNPH), are among the most widely used derivatives for mass spectral characterization of carbonyl compounds. <i>Mono</i>-2,4-DNPH's of <i>n</i>-aldehydes of C₅ or more and <i>n</i>-ketones of C₆ or more exhibit prominent fragmentation peaks: the aldehydes giving strong peaks at masses 224 and 206, methyl ketones at masses 238 and 178, and ethyl ketones at masses 252 and 178. All show a distinct peak at M-35. Mass 182 is reported to be significant for <i>mono</i>-2, 4-DNPH using the time-of-flight mass spectrometer. Spectra of two steroid <i>mono</i>-2, 4-DNPH's run in this laboratory showed M-35 as the only characteristic peak shared with the straight chain series and not the characteristic <i>bis</i>-2, 4-DNPH peaks.

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