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.
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