Condensed thiophene ring systems. XVIII. Thienoazepines and thienobenzoxazoles from 6-azidobenzo[b]thiophenes was written by Iddon, Brian;Pickering, Michael W.;Suschitzky, Hans;Taylor, David S.. And the article was included in Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) in 1975.Formula: C8H4Br2S This article mentions the following:
Addnl. data considered in abstracting and indexing are available from a source cited in the original document. Photolysis of the azidobenzothiophene I (R = R1 = Br, R2 = H, R3 = N3) with Et2NH gave, after 9 hr the azepine II (R = R1 = Br) and a trace of aminothiophene I (R = R1 = Br, R2 = NH2, R3 = NEt2) (III), whereas after 18 hr the products were mainly III with a trace of II (R = R1 = Br). Similar treatment of I (R = H, CO2Me, R1 = R2 = H, R3 = N3) gave the thiophene I (R = R1 = H, R2 = NH2, R3 = NEt2) and the azepine II (R = CO2Me, R1 = H), resp. I (R = R1 = Br; R = CO2Me, R1 = H) on heating with polyphosphoric acid and AcOH gave oxazoles IV. Heating 6-azidobenzo[b]thiophene 1,1-dioxide similarly gave the linear benzoxazole V. In the experiment, the researchers used many compounds, for example, 2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7Formula: C8H4Br2S).
2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7) belongs to benzothiophene derivatives. Benzothiophene finds use in research as a starting material for the synthesis of larger, usually bioactive structures. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Formula: C8H4Br2S
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem