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Fragmentation of N, N-dialkyl-7-[alkyl and 2-(vinyloxy)ethyl]-2,7-dihydrothiopyrano[2,3-b]pyrrol-6-amines under electron impact (70 eV) and chemical ionization (methane as reactant gas) has been studied. The electron impact ionization of these compounds gives rise to stable molecular ions which decompose according to two main pathways. The major pathway involves cleavage of the N7—CAlk bond with elimination...