Phosphorus-31 chemical shifts salt effect

Ionic dissociation of carbon-carbon a-bonds in hydrocarbons and the formation of authentic hydrocarbon salts, 30, 173 Ionization potentials, 4, 31 Ion-pairing effects in carbanion reactions, 15, 153 Ions, organic, charge density-NMR chemical shift correlations, 11,125 Isomerization, permutational, of pentavalent phosphorus compounds, 9, 25 Isotope effects, hydrogen, in aromatic substitution reactions, 2,163... [Pg.338]

Phosphorus compounds give resonances in characteristic ranges depending primarily on the oxidation state and coordination munber of the phosphorus atoms present (Table 1). Chemical shifts also depend on the pH, concentration, and salt content of the solution, solvent effects, and the electronegativity of any substituents. Since the phosphorus atom is a comparatively reactive center, it can usually... [Pg.3320]