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 Studies of initiation mechanism of maleimide/vinyl ether copolymerizations, published in 2000, which mentions a compound: 4144-22-3, Name is 1-(tert-Butyl)-1H-pyrrole-2,5-dione, Molecular C8H11NO2, Electric Literature of C8H11NO2.
Previous work has shown that transferable hydrogens play an important role in the photoinduced polymerization of maleimides and vinyl ethers. In order to study this effect systematically, several maleimide and vinyl ether combinations (with/without transferable hydrogens) were prepared The polymerization rate and extent of conversion were evaluated by real-time FTIR. In addition, laser flash photolysis was used to investigate the quenching processes of the excited triplet state of each maleimide by various vinyl ether monomers. Quenching of the triplet state of maleimides by vinyl ethers occurs by an electron transfer process that is independent of the presence of transferable hydrogens. Transferable hydrogens are essential for rapid polymerization indicating that radicals capable of initiating polymerization are produced from the anion radical of the maleimide via a proton transfer process.
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Reference:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics