Abstract The mass spectral behaviour of the difunctional alkane N-acetyl-4-phenyl- butylamine (3) was investigated. The main fragmentation of compound 3 is caused by the interaction on the two functional groups, which could be shown by comparison of the corresponding monofunctional compounds n-butylbenzene (4) and N-acetyl-n-butylamine (5). On the bases of high resolution data, the analyses of metastable transitions and the ...