Kinetic data and activation parameters are reported for the reaction of a series of tricoordinate phosphorus compounds, [Ar,P(OR),], w i t h diaryl trisulfides. The second-order rate coefficients for series of arylphosphines, phosphinites and phosphonites, correlate with the Hammett 0 constants of the aryl substituents with p values of -1.1, -1.1 and -1.1 respectively and these results are discussed in terms of a biphilic mechanism analogous to that proposed for the reaction of tricoordinate phosphorus with S, .
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