A range of compounds containing two 3-oxygenated thiophene rings linked through the oxygen atoms by a variety of alkyl and heteroalkyl chains has been prepared and subjected to electrophillic substitution, at C(2) and C(2′), giving, inter alia, bis-Mannich bases containing 14- to 22-membered rings; preliminary X-ray diffraction studies of representative metal complexes are in hand.
J. M. Barker, J. D. E. Chaffin, J. Halfpenny, P. R. Huddleston and P. F. Tseki, J. Chem. Soc., Chem. Commun., 1993, 1733 DOI: 10.1039/C39930001733
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