Abstract
The kinetic parameters of the tritium exchange between*H2O(*D2O) and (CH3)2PH in the gas phase and between*H2O(*D2O) and (C6H5)2PH in liquid were measured. Both reactions appeared to be heterogeneous ones. The*HH/*DD kinetic isotope effects were estimated and compared with the results of exchange between methanol and phosphines. The differences in isotope effects are explained by the change of the symmetry of the four center cyclic transition complex resulting from the various type of solvation of this complex.
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