PHOSPHORANES MONOCYCLIQUES A LIGAND HYDROGENE I-ETUDE DE L'EQUILIBRE DE FORMATION

Abstract Addition of compounds containing a mobile hydrogen (alcohols, amines …) to derivatives of tetramethyldioxaphos-pholane leads to monocyclic phosphoranes including a P[sbnd]H bond in equilibrium with the starting phospholane: Study of this equilibrium by 31P, 1H and 13C NMR shows a real dependence on solvent, temperature and concentrations of the reagents. Keeping in mind a BPT structure, the NMR data suggest an apical position for the H bonded to P in phosphoranes obtained by reaction with amines. L'addition de composes a hydrogene mobile (alcools, amines …) sur des derives du tetramethyldioxaphospholane conduit a des phosphoranes monocycliques a ligand PH en equilibre avec le phospholane de depart: Cet equilibre etudie par RMN de 31P, 1H, 13C montre une nette dependance vis-a-vis des concentrations relatives des reactifs, des solvants et de la temperature. Les parametres de RMN conduisent, dans l'hypothese d'une bipyramide trigonale, a proposer une position apicale pour l'hydrogene lie au phospho...

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