Abstract
Amino acid-bridged dicatechol ligands 2a-e-H4 were prepared by peptide coupling reactions. Under special conditions, an unusual BBr3-promoted amide to methyl ester transformation was observed for the asparagine and glutamine side chain functions. The ligands were used in coordination studies with titanium(IV) ions in the presence of an alkali metal carbonate. Double-stranded complexes Li2[(2a-e)2(OR)2Ti2] which have alcoholate coligands (R = CH3, C2H5, C3H5) bridging the metals were selectively formed with lithium counter cations. On the other hand, with potassium or sodium cations triple-stranded complexes M4[(2b,c,e)3Ti2] were obtained in addition to the double-stranded M2[(2b,c,e)2(OCH3)2Ti2] (M = Na, K).
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