Electron impact mass spectrometry of some naphthoxypolymethylenethiopyrimidines

The electron impact induced fragmentation of a large number of 2- and 4-S-(2-naphthoxy)-polymethyienethiouracils is discussed in detail, with the aid of exact mass measurements and observation of metastable decompositions. The 2- and 4-thiopyrimidine structures can be easily distinguished by their mass spectra.