By Grushka E. (ed.), Grinberg N. (ed.)
Quantity forty six contains new advances in two-dimensional fuel chromatography, reversed section liquid chromatography/shape selectivity, and supercritical fluid chromatography. The publication highlights enantioselective separations with emphasis on chiral popularity mechanisms, screening techniques, and separation velocity. It additionally emphasizes hyphenated ideas and more desirable fluidity chromatography with emphasis on monolithic organo-silica hybrid columns. This quantity presents a superb place to begin for gaining fast wisdom to the sector of separation technology.
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Extra info for Advances in Chromatography, Volume 46
7 mmol tBuCQN selector g−1 ) , separation factors may be decreased because the binding sites may be blocked by adjacent SO units and not be accessible anymore. 60252: “60252_c001” — 2007/10/1 — 14:19 — page 28 — #28 Liquid Chromatographic Enantiomer Separation and Chiral Recognition 29 In another study, alternative surface anchoring strategies were investigated . Instead of immobilization via the vinyl-double bond of the quinuclidine at carbon C11, bonding via the carbamate residue as in the prototype cinchona carbamate CSPs (type I and II) was pursued, using, for example, O-9-(1,1-dimethylbut-3-enyl) or O-9-(3-isopropenyl-α,α-dimethylbenzyl) carbamates to maintain the favorable bulky tert-butyl structural element.
M. , Chirality, 11: 522 (1999). With permission. d. not determined. tBuCQN, 9-O-(tert-butylcarbamoyl)quinine; tBuCEQD, 9-O-(tert-butylcarbamoyl)epiquinidine; tBuCEQN, 9-O-(tert-butylcarbamoyl)epiquinine; tBuCQD, 9-O(tert-butylcarbamoyl)quinidine. 3 Enantioseparation Data for N-protected α-Amino Acids and Aryloxycarboxylic Acids on CSPs based on tert Butylcarbamates of C8 /C9 Stereoisomeric Cinchona Alkaloids 26 Advances in Chromatography, Volume 46 60252: “60252_c001” — 2007/10/1 — 14:19 — page 26 — #26 Liquid Chromatographic Enantiomer Separation and Chiral Recognition 27 and/or steric factors may be invoked to explain this selectivity enhancement effect of the larger alkoxy substituents.
J. Sep. , 29: 1486 (2006). ) the other hand, the cinchonan carbamate selector may be decorated via the carbamate residue with additional supportive binding sites such as aromatic functionalities (πacidic and π-basic aromatic systems, respectively), and so forth. Such modifications showed also great promise and, in particular, complementary selectivity profiles which partly extended or shifted application spectra. Anumber of aromatic carbamates have been tested including, for example, π-basic ones, such as 2,6-diisopropylphenyl, α- and β-naphthyl, phenyl, trityl as well as π-acidic ones such as 3,4- and 3,5-dichlorophenyl, 3,5-dinitrophenyl, and 3,5-bis-(trifluoromethyl)phenyl .
Advances in Chromatography, Volume 46 by Grushka E. (ed.), Grinberg N. (ed.)