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 Lewis-Base Adducts of Group 11 Metal(I) Compounds. LXXV. Structural Systematics of the Binuclear Copper(I) Halide: 1,5-Cyclooctadiene (cod) 2:2 Adducts, [(cod)Cu(μ-X)2Cu(cod)], X = Cl, Br, I, published in 2004-09-30, which mentions a compound: 32717-95-6, Name is Chloro(1,5-cyclooctadiene)copper(I) dimer, Molecular C16H16Cl2Cu2, Safety of Chloro(1,5-cyclooctadiene)copper(I) dimer.
Adducts of 1,5-cyclooctadiene (cod) with the copper(I) halides, CuX (X = Cl, Br, I) of 1:1 stoichiometry are confirmed as binuclear species of [(cod)Cu(μ-X)2Cu(cod)] by single crystal x-ray studies, those for X = Cl, I being executed at low-temperature The study for X = Cl is a redetn., exposing disorder in one of the copper atom sites; a similar redetn. of [Cu(cod)2](ClO4) shows disorder in respect of one of the ligands. Bonding parameters are compared with those for other Lewis-base analogs.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider