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 Structural Study of Ni(dpm)2 in Solution by X-Ray Absorption Spectroscopy, published in 2002-04-30, which mentions a compound: 14481-08-4, Name is Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), Molecular C22H38NiO4, Product Details of 14481-08-4.
The NiK-absorption spectra of Ni(dpm)2 and its adducts in crystal and solution have been studied. X-ray spectra were recorded on a synchrotron radiation station of the Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences. The fundamental absorption maximum in the compounds is of Rydberg character. The fine structure of the fundamental maximum was used for structure elucidation of the nearest environment of the metal atom of the complex in solutions and adducts. Participation of the highest unoccupied AO of the metal in chem. bonding in the compounds is discussed.
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Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics