AbstractThe mass spectral fragmentation patterns of 26N‐allyl‐,N,N‐diallyl‐, andN‐cyclopropylbenzamides substituted on the acyl part with halo, methoxyl, methyl or nitro groups have been studied. All the compounds gave mass spectra containing diagnostic fragment ions which can be useful for identification purposes. Characteristic ions serving to distinguish between the two structural isomeric amide series are