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 Rapid Palladium-Catalyzed Synthesis of Esters from Aryl Halides Utilizing Mo(CO)6 as a Solid Carbon Monoxide Source, published in 2003-08-31, which mentions a compound: 172418-32-5, Name is trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium, Molecular C46H46O4P2Pd2, Reference of trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium.
A series of aromatic esters R1CO2R2 (R1 = 3-BrC6H4, 2-MeC6H4, 4-MeOC6H4, 4-F3CC6H4, 1-naphthyl; R2 = Bu, Me3SiCH2CH2, PhCH2) was synthesized in moderate to high yields (52-89%) via palladium-catalyzed carbonylation of aryl halides R1X (X = Br, iodo) in the presence of excess of a primary alc. R2OH under microwave irradiation using Mo(CO)6 as a solid carbon monoxide source. The reactions with sterically hindered tert-butanol as an alc. failed or gave low yields of the desired products.
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Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate