Brabander, H. J. published an article in 1973, the title of the article was Synthesis of benzo[b]thiophene-3-carboxaldehydes and -3-carboxylic acids by light catalyzed NBS [N-bromosuccinimide] bromination of 3-methylbenzo[b]thiophenes.Name: 5-Chlorobenzo[b]thiophene-3-carbaldehyde And the article contains the following content:
The benzo[b]thiophene I (R = Me, R1 = Cl) was brominated with NBS to give a mixture of brominated compounds, which were hydrolyzed with 10% Na2CO3 to give 88% I (R = CHO, R1 = Cl) and 2-bromo-5- chlorobenzo[b]thiophene-3-carboxaldehyde (94:2:5). I (R = CHO, R1 = Cl) was brominated with NBS to give I (R = CO2H, R1 = Cl). I (R = CO2H, R1 = F) was similarly prepared The experimental process involved the reaction of 5-Chlorobenzo[b]thiophene-3-carbaldehyde(cas: 16296-68-7).Name: 5-Chlorobenzo[b]thiophene-3-carbaldehyde
The Article related to benzothiophenecarboxylic acid chloro, benzothiophene methyl bromination, bromination methylbenzothiophene, Heterocyclic Compounds (One Hetero Atom): Thiophenes and other aspects.Name: 5-Chlorobenzo[b]thiophene-3-carbaldehyde
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem