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  • Cyclodextrins  (2)
  • chromatography  (2)
  • Asymmetric catalysis  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Circular dichroism detection in HPLC (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 3 (1991), S. 376-385 
    Details
    ISSN: 0899-0042
    Schlagwort(e): circular dichroism ; detection system ; chromatography ; chiral discrimination ; enantiomeric excess ; elution order ; dissymmetry factor ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A circular dichroism-based detection system presents several advantages in the HPLC analysis of chiral compounds because of the selective monitoring of optically active molecules. Its use allows reliable determination of enantiomeric excesses and elution order. To this end, the application of empirical, semiempirical, and nonempirical methods to get stereochemical information from the CD signal is reported. Furthermore, recording the CD spectra on line and evaluation of the dissymetry factor make the CD detection very powerful in characterizing the stereochemistry of chiral eluates.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/chir.530030424
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Resolution of some β-hydroxyphenethylamines as N-(3,5-dinitrobenzoyl) amides on chiral stationary phases derived from cinchona alkaloids (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 1 (1989), S. 161-166 
    Details
    ISSN: 0899-0042
    Schlagwort(e): chromatography ; chirality ; chiral recognition ; β-aminoalcohols ; stereochemistry ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Three chiral stationary phases, obtained by derivatizing γ-mercaptopropylsilanized silica gel with quinine, quinidine, and cinchonidine, have been employed in the resolution of N-acyl derivatives of β-hydroxyphenethylamines. The use of circular dichroism for detection and NMR analysis of analyte-selector mixtures provides an experimental basis for preliminary assignment of a recognition mechanism.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/chir.530010210
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Benzoylated and Benzylated Cyclodextrins: A New Class of Chiral Solvating Agents for Chiral Recognition of 3,5-Dinitrophenyl Derivatives by 1H-NMR Spectroscopy (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 2009-2012 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Cyclodextrins ; NMR spectroscopy ; Chiral solvating agent ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Benzoylated and benzylated cyclodextrins give rise to non-equivalence in the 1H-NMR spectra of racemates of 3,5-dinitrophenyl derivatives of chiral amines, amino alcohols, alcohols, carboxylic acids and amino acids in CDCl3 solution, suggesting their potential use as CDCl3-soluble cyclodextrinic chiral solvating agents (CSAs) in NMR spectroscopy. Cyclodextrins bearing aromatic substituents at the primary or secondary sites only are more efficient CSAs compared to exhaustively substituted ones. NMR investigations based on NOE measurements or complexation shift determinations strongly suggest non-inclusive interaction mechanisms for these selector/selectand systems.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 4
    Digitale Medien
    Digitale Medien
    Chiral Atropisomeric Metalloporphyrins in the Enantioselective Styrene Epoxidation (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1165-1171 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Porphyrinoids ; Asymmetric catalysis ; Atropisomerism ; Epoxidation ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: -A new series of porphyrins has been synthesised, incorporating four identical chiral binaphthyl derivatives in the meso-positions. Owing to a hindered rotation around the bond between the naphthyl and the porphyrin, four atropisomers are generated, which were fully separated by preparative TLC and thoroughly characterised. The free bases were metallated with iron(III) and manganese(III) and the resulting complexes were used as catalytic precursors in styrene epoxidation. The reactions show chemoselectivity and enantioselectivity, depending on the stereochemistry of the metalloporphyrin. It is demonstrated that highest efficiency is performed by the ααββ isomer, showing C2 symmetry.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 5
    Digitale Medien
    Digitale Medien
    NMR Detection of the Conformational Distortion Induced in Cyclodextrins by Introduction of Alkyl or Aromatic Substituents (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 449-453 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Cyclodextrins ; NMR spectroscopy ; NOE ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The conformational features of alkylated, benzoylated, and benzylated cyclodextrins in solution were analysed by NOE and proton-selective relaxation methods and were compared to those of native compounds.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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