Year 205, Month 9 (Section Brief Communications, Page 2219)
Binuclear and polynuclear transition metal complexes
with macrocyclic ligands
7.* Directed step-by-step synthesis of novel unsymmetric macrocyclic ligands**
V. V. Roznyatovsky,(a) N. E. Borisova,(a) M. D. Reshetova,(a) A. G. Buyanovskaya,(b) and Yu. A. Ustynyuk(a)
Novel asymmetric macrocyclic Schiff bases were synthesized by the condensation of
N,N´-bis(2-aminophenyl)-3,4-diphenylthiophene-2,5-dicarboxamide (1) with diformyl derivatives of phenol, furan, difurans, pyridine, pyrrole, and dipyrroles. The reaction proceeds in
high yields and without by-products in methanol in the presence of inorganic and organic acids
(proton-template condensation). In the case of monocyclic diformyl derivatives and
di(5-formylfuran-2-yl) sulfide, the reaction occurs in 1,4-dioxane (templateless synthesis).
The synthesized macrocycles were characterized by elemental analysis data and NMR and
mass spectra.
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