Benzo[b]thiophenium sulfur-carbon ylides: preparation, structure and comparison with thiophenium analog was written by Vuorinen, Eino;Chalmers, Anthony A.;Dillen, Jan L. M.;Modro, Tomasz A.. And the article was included in Tetrahedron in 1991.Reference of 6287-82-7 This article mentions the following:
A series of new sulfur-carbon ylides I (R1 = Br, Cl, Me, H, R2 = Br, Cl, H, X = OEt, OCMe3, OMe, Y = Me, OEt, OMe, XY = CH2CMe2CH2) derived from benzo[b]thiophenes II and YCOCN2COX were prepared and characterized. NMR (1H, 13C) studies revealed that ylides substituted addnl. at position 2 of the thiophene ring can exist as pairs of diastereomers, not interchangeable at room temperature The slow exchange between the two sites was attributed to the restricted rotation about the ylide S-C bond. In the experiment, the researchers used many compounds, for example, 2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7Reference of 6287-82-7).
2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The core structure is a part of various pharmaceutical substances and natural products. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Reference of 6287-82-7
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem