Geometry and Aromaticity in Highly Strained Heterocyclic Allenes: Characterization of a 2,3-Didehydro-2H-thiopyran was written by Nikitina, Asya F.;Sheridan, Robert S.. And the article was included in Organic Letters in 2005.COA of Formula: C9H5NS This article mentions the following:
The highly strained cyclic allene 2,3-didehydro-2H-thiopyran was generated by irradiation of matrix-isolated 2-benzothienylchlorocarbene and characterized by IR and UV/vis spectroscopy, in situ trapping, and DFT modeling. Calculations indicate that the allenic moiety in this system, although less aromatic in character, is relatively more stable than in the corresponding oxa system. It is suggested that the thio ring system can more readily accommodate the allenic geometry. In the experiment, the researchers used many compounds, for example, Benzo[b]thiophene-2-carbonitrile (cas: 55219-11-9COA of Formula: C9H5NS).
Benzo[b]thiophene-2-carbonitrile (cas: 55219-11-9) belongs to benzothiophene derivatives. Benzothiophenes are valuable heterocycles that are widely used in medicines, agrochemicals, and materials science. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, sertaconazole, and also BTCP.COA of Formula: C9H5NS
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem