Electron impact mass spectrometry of some macrocyclic tetraesters

Abstract
The electron impact mass spectrometric behaviour of five recently synthesized macrocyclic tetraesters is described and discussed in detail with the aid of exact mass measurements, linked scans and collisional activation experiments. The unusual primary loss of a dehydrogenated catecholic radical leads to a very stable cation which is the precursor of the most of the fragmentation products.