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 N-Heterocyclic Carbene Acyl Anion Organocatalysis by Ball-Milling, published in 2020, which mentions a compound: 286014-53-7, Name is 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, Molecular C21H25BF4N2, Category: bromides-buliding-blocks.
The ability to conduct N-heterocyclic carbene-catalyzed acyl anion chem. under ball-milling conditions was reported for the first time. This process was exemplified through applications to intermol.-benzoin, intramol.-benzoin, intermol.-Stetter and intramol.-Stetter reactions including asym. examples and demonstrated that this mode of mechanistically complex organocatalytic reaction can operated under solvent-minimized conditions.
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Reference:
Bromide – Wikipedia,
bromide – Wiktionary