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 One-Pot Synthesis of α-Diazo-γ,δ-unsaturated Esters as Versatile Building Blocks for Functionalized Dienes, Cyclopentenes, and 5,7-Fused Bicycles, published in 2021-08-06, which mentions a compound: 138984-26-6, Name is Dirhodium(II) tetrakis(caprolactam), Molecular C24H40N4O4Rh2, Name: Dirhodium(II) tetrakis(caprolactam).
The synthesis of novel allylic α-diazo carbonyl compounds I [R = Et, n-Pr, Ph, etc.] was achieved through a one-pot strategy involving base-catalyzed allylation of 1,3-dicarbonyls with readily available allylic bromides followed by the deacylative diazo transfer reaction. Besides the broad substrate scope related to this method, other relevant features included the use of simple and inexpensive reagents, non-toxic solvents and mild reaction conditions. The synthetic utility of these α-diazo-γ,δ-unsaturated esters was further demonstrated through rhodium-catalyzed transformations, where the type of product formed was dependent on both the substrate and catalyst employed. Thus, treating α-diazo-γ,δ-unsaturated esters with catalytic Rh2(pfb)4 in acetonitrile under reflux resulted in a diastereoselective β-hydride migration to give 2Z,4E-dienes RCH=C(COOMe)CH=CHCOOEt in good yields. On the other hand, the combination of Rh2(OAc)4 as the catalyst in toluene under reflux for 10 min led the aryl-substituted diazo compounds to a regioselective intramol. Buchner reaction to furnish 5,7-fused bicyclic tetraenes II [X = H, 4-F, 5-Cl, etc.] in high yields, while the alkyl-substituted analogs undergo intramol. C-H insertion to give functionalized cyclopentenes of anti-configuration.
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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI