The mass spectrometry of volatile derivatives—II: N‐alkyl trifluoracetamides

Abstract

Abstract Under electron‐impact, N‐alkyl trifluoracetamides exhibit peaks due to [CF 3 ] + and [M  CF 3 ] + . Ions corresponding to [COCF 3 ] + are absent. The base peak in many straight chain derivatives occurs at m/e 126 due to alkyl radical loss from the molecular ion; the mass of this ion rising to m/e 140 in the α‐substituted N‐sec‐butyltrifluoracetamide and to m/e 154 in the tert‐butyl derivative. High resolution measurements on a number of peaks indicate that they originate by loss of HF from other fragment ions.