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 Dual Cobalt and Photoredox Catalysis Enabled Redox-Neutral Annulation of 2-Propynolphenols, published in 2021-07-01, which mentions a compound: 1762-34-1, Name is 5,5′-Dimethyl-2,2′-bipyridine, Molecular C12H12N2, Quality Control of 5,5′-Dimethyl-2,2′-bipyridine.
A hydroxyl-assisted, organophotoredox/cobalt dual catalyzed annulation of 2-propynolphenols I [R1 = H, R2 = H, F, Cl, Br, MeO2C, Me; R1 = Cl, R2 = H; R1 = R2 = F; R3 = R4 = Me, Ph, 4-FC6H4, 3-F3CC6H4, etc.; R3 = Ph, R4 = Me, 4-ClC6H4, 2-FC6H4, 4-F3CC6H4, 2-thienyl, etc.; R3 = 4-FC6H4, R4 = 4-MeOC6H4; R3R4 = (CH2)5] to form 2-(hydroxymethyl)benzo[b]furans II has been developed by employing 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) as photosensitizer and CoCl2(PPh3)2/5,5′-dimethyl-2,2′-bipyridine as cobalt catalytic precursor. Various substrates and functional groups were tolerated. The practical applications of this reaction were further demonstrated by enlarged gram-scale and various derivations for complex heterocycles. Primary mechanistic studies suggested the involvement of cobalt-hydride mediated hydrogen atom transfer (HAT) process.
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