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 Reversible C:C Bond Activation by an Intramolecularly Coordinated Antimony(I) Compound, published in 2019, which mentions a compound: 4144-22-3, Name is 1-(tert-Butyl)-1H-pyrrole-2,5-dione, Molecular C8H11NO2, Electric Literature of C8H11NO2.
Bicyclic antimony amido-imine complexes I (2a-c; R = Me, tBu, Ph) were prepared by insertion of N-substituted maleimides into antimony-nitrogen bond of 1,3-benzenedicarbaldimine complex [SbC6H3-2,6-(CH:NtBu)2] (1). The reaction of N,C,N-chelated stibinidene ArSb 1 with selected N-alkyl/aryl-maleimides RN(C(O)CH)2 (R = Me, tBu, Ph) gave the addition products with bridged bicyclic [2.2.1] structure containing an antimony atom at the bridgehead position, fused with a 6-membered benzene and a 5-membered N-alkyl/aryl-pyrrolidine ring. These compounds were completely characterized. More importantly, addnl. studies showed that these reactions are reversible in solution, thereby representing an unprecedented reversible activation of a C:C bond by an antimony(I) compound
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Reference:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics