Antina, E. V.; Guseva, G. B.; Loginova, A. E.; Semeikin, A. S.; V’yugin, A. I. published the article 《Synthesis and spectral properties of new 3,3′-bis(dipyrrolylmethene) with acetylene spacer》. Keywords: bistetramethyl ethyldipyrrolylmethenyl acetylene dihydrobromide preparation; quantum chem simulation conformation spectral.They researched the compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2 ).SDS of cas: 2199-44-2. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:2199-44-2) here.
Bis(2,4,7,9-tetramethyl-8-ethyldipyrrolylmethen-3-yl)acetylene dihydrobromide (H2L·2HBr), new bis(dipyrrolylmethene), in whose mol. dipyrrolylmethene domains were connected through 3,3′-carbon atoms of internal pyrrole nuclei by acetylene spacer, were synthesized by original procedure. The compound was characterized by element anal., IR, 1H NMR, and electronic spectroscopy. The comparative anal. of spectral properties shows the reduction of the basicity of H2L ligand in comparison with the structural analogs, which contain internal methylene spacer. The quantum-chem. simulation showed that the rigid acetylene spacer gives linear structure to the H2L mol. in contrast to the spiral-shaped geometry of structural analogs with -CH2- spacer.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com