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 Complexation between decamethyl-3,3′-bis(dipyrrolylmethene) and zinc(II), copper(II), and cobalt(II) acetates, published in 2009-01-31, which mentions a compound: 2199-44-2, Name is Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, Molecular C9H13NO2, Reference of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.
Decamethylmethylene-3,3′-bis(dipyrrolylmethene) dihydrobromide H2L·2HBr, which is the simplest representative of a novel class of oligo(dipyrrolylmethenes) belonging to chromophore chelating nonmacrocyclic ligands, were examined by 1H NMR, IR, and electronic absorption spectroscopy. Complexation reactions of H2L·2HBr with M(AcO)2 (M = Zn(II), Cu(II), and Co(II)) in DMF at 298.15 K were monitored by electronic absorption spectroscopy and studied by the molar ratio method. The thermodn. constants K0 of these reactions were estimated The d metal ions coordinate H2L to give the binuclear homoleptic complexes [M2L2]. The reactions proceed through the intermediate binuclear heteroleptic complex [M2L(AcO)2] detected by spectroscopic methods. The thermodn. stabilities of [M2L2] and [M2L(AcO)2] increase when moving from Cu(II) to Zn(II) and Co(II). The probability of formation and stability of [M2L2] containing 3,3′-bis(dipyrrolylmethene) are substantially higher than those of analogous complexes with the 2,2′-isomer (decamethyl-2,2′-biladiene-a,c). The low K0 values for the complexation between H2L and Cu(AcO)2 are due to slow oxidation of the biladiene ligand into a bilatriene with participation of Cu2+ ions.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com