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Beilstein J. Org. Chem. 2009, 5, No. 78, doi:10.3762/bjoc.5.78
Graphical Abstract
Figure 1: Structural formula of the siderophore enterobactine.
Scheme 1: Preparation of the compound 1a-H3 by utilization of a multiple Claisen-rearrangement.
Figure 2: 1H NMR spectra (300 MHz, CDCl3) of the ether compound 4 (top) and the ligand 1a-H3 (bottom).
Figure 3: Positive ESI MS of [(1a)La] in chloroform showing the peaks of {K[(1a)La]}+ (m/z = 1600.8) as well ...
Figure 4: CD and UV absorption titration curves for complexation of ligand 1a-H3 with lanthanum(III)nitrate h...
Figure 5: Titration curve observed for ligand 1a-H3 upon addition of lanthanum(III) nitrate hexahydrate.
Figure 6: Molecular structures of the Λ2 (left) and Δ2 (right) isomers of complex 1b·La calculated by using B...
Figure 7: UV and CD spectra of the complex (Λ)-1·La. Blue and violet curve: experimentally determined spectra...