Decomposition of thiopyrans to thiophenes under electron impact was written by Bogdanowicz-Szwed, Krystyna;Nagraba, Krzysztof. And the article was included in Organic Mass Spectrometry in 1984.Synthetic Route of C8H8N2S This article mentions the following:
Fragmentation patterns for I (n = 3, 4, 5; R = H, Cl, Br, Me) are discussed. The mass spectra of I showed peaks of high intensity in the mol. ion region, with rel. abundance varying from 20 to 60% of the base peak. The fragmentation of the [I]+· occurred as a one-step process with ejection of RC6H4NC as well as by a two-step process involving loss of RC6H4· and CN· radicals. In the experiment, the researchers used many compounds, for example, 2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile (cas: 70291-62-2Synthetic Route of C8H8N2S).
2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile (cas: 70291-62-2) belongs to nitriles. The electronic structure of nitriles is very similar to that of an alkyne with the main difference being the presence of a set of lone pair electrons on the nitrogen. Some nitriles are manufactured by heating carboxylic acids with ammonia in the presence of catalysts. This process is used to make nitriles from natural fats and oils, the products being used as softening agents in synthetic rubbers, plastics, and textiles and for making amines.Synthetic Route of C8H8N2S
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts