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 Polymer-supported reagents: polar effects in substrate selectivity, published in 1982-07-01, which mentions a compound: 57825-30-6, Name is 1-(Bromomethyl)-4-ethylbenzene, Molecular C9H11Br, Application In Synthesis of 1-(Bromomethyl)-4-ethylbenzene.
A selectivity effect was observed in the competitive reaction of a polymer-supported nucleophile with pairs of halides of analogous size but different polarity. Competitive esterification with Amberlyst A-26 (AcO-) of Br(CH2)4CO2Et and Me(CH2)7Br showed a marked preference for the halide with a polar tail, the relative rates being 1.9 and 1.0, resp.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider