Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Journal of Organic Chemistry called Ligand-Induced Selectivity in the Rhodium(II)-Catalyzed Reactions of α-Diazo Carbonyl Compounds, Author is Padwa, Albert; Austin, David J.; Hornbuckle, Susan F., which mentions a compound: 138984-26-6, SMILESS is C12=O[Rh+2]3(O=C4[N-]5CCCCC4)([N-]6C(CCCCC6)=O7)[N-](CCCCC8)C8=O[Rh+2]357[N-]1CCCCC2, Molecular C24H40N4O4Rh2, COA of Formula: C24H40N4O4Rh2.
3-Allyl-1-diazo-5-phenyl-2,5-pentanedione and 3-(3-butenyl)-1-diazo-5-phenyl-2,5-pentanedione were allowed to react with a trace amount of a rhodium(II) catalyst in methylene chloride at room temperature The major products isolated corresponded to the internal trapping of a carbonyl ylide as well as intramol. cyclopropanation. Changing the catalyst from Rh2(OAc)4 to Rh(II) caprolactamate to Rh(II) trifluoroacetate caused a significant alteration in product distribution. A rather unusual and unexpected regiochem. crossover in the cycloaddition occurred when Rh(II) trifluoroacetate was used and is most likely due to complexation of the metal with the dipole. A computational approach to rationalize the observed product distribution was carried out. The thermodn. stabilities of cycloaddition transition states were approximated from the computationally derived strain energies of ground state mols. using traditional force-field techniques. Globally minimized ground state energies were obtained for all possible cycloaddition products, and final strain energies were calculated In all cases studied, the lower energy isomer corresponded to the cycloadduct actually isolated. A study of the regiochem. aspects of the Rh(II)-catalyzed reaction of 1-diazo-3-(2-oxo-2-phenylethyl)hexane-2,5-dione was also carried out. Cyclization of the initially formed rhodium carbenoid occurred exclusively across the acetyl rather than the benzoyl group. The structure of the internal cycloadduct was assigned on the basis of a proton-detected multiple-bond heteronuclear multiple-quantum coherence experiment
This literature about this compound(138984-26-6)COA of Formula: C24H40N4O4Rh2has given us a lot of inspiration, and I hope that the research on this compound(Dirhodium(II) tetrakis(caprolactam)) can be further advanced. Maybe we can get more compounds in a similar way.
Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI