Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Organometallics called N,N’-Diferrocenyl-N-heterocyclic Carbenes and Their Derivatives, Author is Bildstein, Benno; Malaun, Michael; Kopacka, Holger; Wurst, Klaus; Mitterboeck, Martin; Ongania, Karl-Hans; Opromolla, Giuliana; Zanello, Piero, which mentions a compound: 1273-73-0, SMILESS is Br[C-]12[Fe+2]3456789([C-]%10C6=C7C8=C9%10)C1=C3C4=C25, Molecular C10BrFe, Recommanded Product: 1273-73-0.
In continuation of the authors’ work on Wanzlick/Arduengo carbenes containing redox-active ferrocenyl substituents the synthesis of N,N’-diferrocenyl imidazol(in)ium salts as precursors of imidazol(in)-2-ylidenes is reported. The necessary starting material for this chem. is aminoferrocene, which was prepared by an improved and large-scale synthesis by the sequence solid lithioferrocene, iodoferrocene, N-ferrocenylphthalimide, aminoferrocene. The preparation of N,N’-diferrocenyl heterocycles involves condensation of aminoferrocene with glyoxal to afford N,N’-diferrocenyldiazabutadiene [Fc-DAB], reduction, condensation with formaldehyde, and oxidation with trityl salts to yield N,N’-diferrocenylimidazol(in)ium salts. In situ deprotonation and trapping with electrophiles yielded the expected metal complexes and derivatives in some cases [Ag+ or S8], but attempted reaction with other transition metals [e.g., Pd(II)] failed to give the corresponding complexes, due to (i) steric hindrance by the two N-ferrocenyl substituents, (ii) reduced acidity of the imidazol(in)ium precursors, and (iii) inaccessibility of the free carbenes. Spectroscopic [IR, Raman, UV-visible, MS, NMR (1H, 13C, 109Ag)], structural [x-ray], and electrochem. [CV] properties are reported and compared to those of other N-heterocyclic carbene derivatives
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com