Dehaen, W., Gale, P.A., Garcia-Garrido, S.E., Kostermans, M. and Light, M.E.
Anion recognition by N-confused calixpyrrole-alpha-carbaldehyde and its Knoevenagel reaction derivatives
New Journal of Chemistry, 31, (5), . (doi:10.1039/b616467f).
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The synthesis of a N-confused calixpyrrole--carbaldehyde is reported, together with its Knoevenagel reaction derivatives. The X-ray crystal structure of the aldehyde and two derivatives are reported showing the macrocycles adopting confused 1,3-alternate conformations in all cases. The affinity of these macrocycles for a range of anionic guests has been measured in DMSO-d6/0.5% water, and the results compared with the parent N-confused calixpyrrole parent macrocycle. These studies show that the derivatives have a significantly higher affinity for anionic guests than the parent system
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