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  • 1
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The NMR spectra of the trivalent fluorophospholanes (1, 2, 3) have been analysed at length. The absolute signs of the 3J(P—H) and 4J(F—H) coupling constants have been referred to the known negative sign of the 1J(P—F) coupling constant from selective heteronuclear double resonance experiments. The 3J(P—O—C—H) and 3J(P—N—C—H) coupling are positive. The weak values observed for 3J(P—S—C—H) have opposite signs, the larger being positive. All the 4J(F—P—X—C—H) coupling constants are positive showing a lack of stereospecificity.
    Notes: On a réalisé l'analyse complète des spectres de RMN des fluorophospholanes (1 à 3). Les signes absolus des constantes de couplage 3J(P—H) et 4J(F—H) ont été déterminés, par rapport au signe absolu connu de la constante 1J(P—F), à partir d'expériences de double résonance hétéronucléaire sélective. Les constantes 3J(P—O—C—H) et 3J(P—N—C—H) observées sont toutes positives. Les deux constantes 3J(P—S—C—H) du dithiaphospholane (2) présentent des faibles valeurs de signes opposés, la plus grande étant positive. Toutes les constantes 4J(F—P—X—C—H) sont positives et ces constantes semblent peu stéréospécifiques.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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