Abstract
1. The transmetallation method has been used to measure equilibrium acidities of P(O)H-and P(S)H-acids of various structures in dimethylsulfoxide solution and relative to 9-phenyl-fluorene. 2. The effect of the substituent at the P atom on the pK value for the P(O)H-acid can be described by linear correlation relations in the σφ and σ* constants. The diarylphosphinous acids cannot be fitted into such correlations because of p,π coupling in their anions. 3. The acidity of the P(S)H-acids is some nine orders higher than that of the phosphoryl analogs.
Published Version
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