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Beilstein J. Org. Chem. 2014, 10, 825–831, doi:10.3762/bjoc.10.78
Graphical Abstract
Figure 1: L-Norleucine, L-isoleucine, and L-leucine.
Figure 2: Concave templates 1 and 2.
Scheme 1: Syntheses of the 2-(9,9’-spirobifluorene-2-yl)trifluoromethansulfonate (7).
Scheme 2: Synthesis of the two receptors 1 and 2.
Figure 3: Schematic presentation of the isomer labelled guest method (ILGM).
Figure 4: ESI-mass spectrum (positive mode) of a 1:1:1 mixture of 1, protonated L-leucine methyl ester (LeuOM...
Figure 5: ESI-mass spectrum (positive mode) of a 1:1:1 mixture of 1, protonated L-leucine methyl ester (LeuOM...
Figure 6: Two different motifs for the binding of substrates to the templates.