Solar thermochemical reactions. Part II. Synthesis of 2-aminothiophenes via Gewald reaction induced by solar thermal energy was written by Mekheimer, Ramadan Ahmed;Ameen, Mohamed Abdallah;Sadek, Kamal Usef. And the article was included in Chinese Chemical Letters in 2008.Name: 2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile This article mentions the following:
Green conditions were developed for the synthesis of substituted 2-aminothiophenes employing multicomponent reactions of a ketone with active methylene nitrile and elemental sulfur induced by free solar thermal energy. In the experiment, the researchers used many compounds, for example, 2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile (cas: 70291-62-2Name: 2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile).
2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile (cas: 70291-62-2) belongs to nitriles. Nitriles are polar, as indicated by high dipole moments. As liquids, they have high relative permittivities, often in the 30s. Nitriles are susceptible to hydrogenation over diverse metal catalysts. The reaction can afford either the primary amine (RCH2NH2) or the tertiary amine ((RCH2)3N), depending on conditions.Name: 2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts