Abstract
1. When the CO ligand in ArCr(CO)3 complexes is replaced by the PPh3 ligand the rate of the hydrogen isotope exchange reaction with CF3COOD increases by more than three orders of magnitude. 2. In protophilic hydrogen isotope exchange reactions with C2H5ONa in C2H5OD the PPh3 ligand retards the hydrogen exchange in the π-benzene ring in C6H6Cr(CO)2PPh3 by approximately 20 times when compared with C6H6Cr(CO)3.
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