By Franz P. Schmidtchen (auth.), Ivan Stibor (eds.)
This treatise on anion sensing and popularity represents a brand new addition to a really small variety of books during this area......
Although this Topics volume doesn't disguise all of the assorted periods fo receptors, it does supply new and well timed views to anion chemistry via highlighting numerous parts which have been as a rule ignored in different reports. the person chapters are well-written and contain references from prior works as much as the current. As such, this quantity can be of curiosity to the group of researchers drawn to anions in addition to to those that desire to find out about the host-guest chemistry of anion popularity and its applications.
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Additional resources for Anion Sensing: -/-
In the organic phase, no valine was detected. 5%, D-Phe<2%). The same principle follows for the receptor 13, designed and synthesized by Schmidtchen . Both recognition structural units have been changed. The aromatic naphthoyl group has been substituted with the bulkier diphenyl-tertbutylsilyl group and the aza-18-crown-6 unit by a symmetrical triaza analog that is known to recognize the ammonium cation with high selectivity against alkali metal cations. This compound was capable of discrimination between enantiomers of phenylalanine.
While the L-enantiomer of protected phenylalanine is complexed inside the cavity of the host molecule, the N-Ac-D-phenylalanine is probably bound outside the cavity via hydrogen bonding to the thiourea group and one of the amidic NH functions. The ability of receptor 41 to bind enantioselectively to the chiral substrates has not yet been examined. The preliminary NMR studies performed with this receptor demonstrated the high affinity of 41 to N-Ac-asparagine (K=8,700 M–1) and N-Ac-glutamine (K=55,000 M–1).
33 . . . . . . . . . . . . . . 37 4 Guanidinium-Based Receptors . . . . . . . . . . . . . . 39 5 Receptors Based on the Amidic Bond . . . . . . . . . . . . 46 6 Urea- and Thiourea-Based Receptors . . . . . . . . . . . . 49 . . . . . . . . 52 . . . . . . . . . . . . . . . 54 . . . . . . . . . . . . . . . . . . . . 61 2 Natural and Modified Natural Receptors 3 Ammonium-Based Receptors 7 Porphyrins and Sapphyrins as Anion Sensing Units 8 Metal-Containing Ligands References Abstract Chiral recognition of anions is still in its infancy.
Anion Sensing: -/- by Franz P. Schmidtchen (auth.), Ivan Stibor (eds.)