Comparison between unimolecular gas phase pyrolysis and electron impact fragmentation. Part I. The mass spectra of tetralin and some related heterocycles

Abstract

The behaviour of tetralin, chroman, isochroman, thiochroman, isothiochroman, 1,2,3,4-tetrahydroquinoline and 1,2,3,4-tetrahydroisoquinoline under electron impact has been investigated with high resolution mass measurement, deuterium-labelled derivatives, and energetic measurements. The general features of the spectra can be explained on the basis of relative bond strengths and probable charge location, the latter being deduced from ionisation potential measurements.