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 Metalation of etioporphyrin I with nickel(II) 1,3-diketonates, published in 1973, which mentions a compound: 14481-08-4, Name is Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), Molecular C22H38NiO4, Synthetic Route of C22H38NiO4.
Kinetic studies of the reaction H2L + NiL12 → NiL + 2HL1 (H2L = etioporphyrin I, HL1 = 2,4-pentanedione, 1,1,1-trifluoro-2,4-pentanedione, 1,1,1,5,5,5-hexafloro-2,4-pentanedione, 2,6-dimethyl-3,5-heptanedione, 2,2,6,6-tetramethyl-3,5-heptanedione, and 1,3-diphenyl-1,3-propanedione) show that the reaction is 1st-order with respect to H2L and either 1st-order or zero-order with respect to NiL12. The presence of trace amounts of H2O inhibits the reaction. NiL12 complexes serve as a metal source in the facile preparation of Ni porphyrins.
In addition to the literature in the link below, there is a lot of literature about this compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))Synthetic Route of C22H38NiO4, illustrating the importance and wide applicability of this compound(14481-08-4).
Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics