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Some aspects of NMR spectroscopy / Laidoudi Bouakkar 

Public ISBD Titre : Some aspects of NMR spectroscopy Type de document : texte imprimé Auteurs : Laidoudi Bouakkar, Auteur ; R. Fields, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1988 Importance : 89 f. Présentation : ill. Format : 30 cm. Note générale : Master of Science : Chemical engineering : University of Manchester : 1988 Bibliogr. f. 90 - 94 Langues : Anglais (eng) Mots-clés : Nuclear  magnetic  resonance  spectroscopy Organic  chemistry Chemical  shifts Coupling  constants Index. décimale : Ms00388 Résumé : This thesis is concerned with the application of NMR spectroscopy to solving problems in organic chemistry. The structure of several tetrafluoropyridines and pentafluorobenzenes was verified, combining the information from ¹⁹F, ¹³C and ¹H spectra. The spectral parameters (chemical shifts and coupling constants) were, when possible, correlated with the character of the substituent. The coupling constants derived from the analysis of the ¹³C and ¹⁹F spectra were used for computer calculation of these spectra. Appropriate decoupling experiments were carried out when the assignment of the chemical shifts or coupling constants was uncertain. Finally, a specific application, the differentiation between the enantiomers of racemic mixtures, using a chiral solvating agent (CSA) was examined. The mixtures for which the experiments were successful were racemic 2,2,2-trifluoro-l-phenylethanol (TFPE), 2-phenylpropionic acid and 2-pentafluorophenylbutyric acid in resolved (ℓ)-α-phenylethylamine (PEA). The enantiomeric shift was also observed for racemic PEA in resolved phenylpropionic acid. In conjunction with these CSA experiments a small amount of racemic TFPE was prepared and an attempt was made to prepare 2,2,2-trifluoro-l-phenylethylamine by an improved route. Some aspects of NMR spectroscopy [texte imprimé] / Laidoudi Bouakkar, Auteur ; R. Fields, Directeur de thèse . - Manchester : [s.n.], 1988 . - 89 f. : ill. ; 30 cm. Master of Science : Chemical engineering : University of Manchester : 1988 Bibliogr. f. 90 - 94 Langues : Anglais (eng) Mots-clés : Nuclear  magnetic  resonance  spectroscopy Organic  chemistry Chemical  shifts Coupling  constants Index. décimale : Ms00388 Résumé : This thesis is concerned with the application of NMR spectroscopy to solving problems in organic chemistry. The structure of several tetrafluoropyridines and pentafluorobenzenes was verified, combining the information from ¹⁹F, ¹³C and ¹H spectra. The spectral parameters (chemical shifts and coupling constants) were, when possible, correlated with the character of the substituent. The coupling constants derived from the analysis of the ¹³C and ¹⁹F spectra were used for computer calculation of these spectra. Appropriate decoupling experiments were carried out when the assignment of the chemical shifts or coupling constants was uncertain. Finally, a specific application, the differentiation between the enantiomers of racemic mixtures, using a chiral solvating agent (CSA) was examined. The mixtures for which the experiments were successful were racemic 2,2,2-trifluoro-l-phenylethanol (TFPE), 2-phenylpropionic acid and 2-pentafluorophenylbutyric acid in resolved (ℓ)-α-phenylethylamine (PEA). The enantiomeric shift was also observed for racemic PEA in resolved phenylpropionic acid. In conjunction with these CSA experiments a small amount of racemic TFPE was prepared and an attempt was made to prepare 2,2,2-trifluoro-l-phenylethylamine by an improved route.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00388	Ms00388	Papier	Bibliothèque centrale	Mémoire de Master	Disponible

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