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The fragmentation mechanisms of the title compounds upon impact with 12 and 60 eV have been studied using mass spectrometry. The molecular ions of the compounds undergo fragmentation involving both the ruptures of bonds and skeleton rearrangements followed by formation of odd- electron ions. The fragmentation pattern is considerably influenced by the nature of the 2- and 3- substituents in the dihydrothiophene ring.

Mass spectrometry of N-[5,5-dimethyl-2(5H)-thienyliden]amines and N-(1-thiaspiro[4.5]dec-3-en-2-yliden)amines