In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Oxidative bromination of aromatic compounds using O-iodoxybenzoic acid with tetraethylammonium bromide, published in 2008, which mentions a compound: 52287-51-1, Name is 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine, Molecular C8H7BrO2, SDS of cas: 52287-51-1.
A mild and selective procedure for the bromination of activated arenes using o-iodoxybenzoic acid and tetraethylammonium bromide is presented. The reactions were carried out at room temperature and gave moderate to excellent yields.
Different reactions of this compound(6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine)SDS of cas: 52287-51-1 require different conditions, so the reaction conditions are very important.
Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics