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Beilstein J. Org. Chem. 2015, 11, 748–762, doi:10.3762/bjoc.11.85
Graphical Abstract
Figure 1: Mono-, di-, and tetravalent axles A1, A2 and A4 and mono-, di-, and tetravalent hosts C1, C2 and C4...
Scheme 1: Overview of the synthesis of the guests A2 and A4. a) Pyrrole (4), BF3·Et2O, DDQ, CHCl3, rt; b) Zn(...
Scheme 2: Synthesis of crown ether hosts C4 and C2: a) K2CO3, LiBr, 17, 2-[2-(2-chloroethoxy)ethoxy]ethanol, ...
Figure 2: Schematic representation of the host–guests complexes. Top: complexes A2@C12, A4@C14, A12@C2 and A14...
Figure 3: 1H NMR (500 MHz, 298 K, CD2Cl2, 3 mM) of a) C1 (top), A2@C12 (middle) and A2 (bottom); b) C1 (top), ...
Figure 4: 1H NMR (500 MHz, 298 K, CD2Cl2, 3 mM) of a) C2 (top), A12@C2 (middle) and A1 (bottom) and b) C4 (to...
Figure 5: Normalized UV–vis absorption spectra (CH2Cl2, 3 μM) of A2, A4, C2 and C4 and their complexes formed...
Figure 6: ESI-Q-TOF-MS spectra (CH2Cl2, 0.2 µM; left hand side) and respective experimental and calculated is...
Figure 7: 1H NMR (500 MHz, 298 K, CD2Cl2, 1 mM) of a) C4 (top), A22@C4 (middle) and A2 (bottom); b) C2 (top), ...
Figure 8: 1H NMR (500 MHz, 298 K, CD2Cl2, 1 mM) of a) C4 (top), A4@C4 (middle) and A4 (bottom) and b) C2 (top...
Figure 9: Normalized UV–vis absorption spectra (CH2Cl2, 2 μM) of the guests A2 and A4 (black), the hosts C2 a...
Figure 10: ESI-Q-TOF-MS spectra (CH2Cl2, 0.2 µM; left hand side) and respective experimental and calculated is...