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 Highest-Tc organic enantiomeric ferroelectrics obtained by F/H substitution, published in 2020, which mentions a compound: 136725-55-8, Name is (R)-(-)-3-Fluoropyrrolidine Hydrochloride, Molecular C4H9ClFN, Safety of (R)-(-)-3-Fluoropyrrolidine Hydrochloride.
Through the strategy of F/H substitution, we precisely designed the highest-Tc (phase transition temperature) organic enantiomeric ferroelecs., (R)- and (S)-(N,N-dimethyl-3-fluoropyrrolidinium) iodide, of which the Tc reaches up to 470 K, far beyond those of other enantiomeric ferroelecs. and also the com. ferroelec. BaTiO3.
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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem