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A comparative study of the solvent deuterium isotope effect in the decarboxylation of phenylpropiolic acid (PPA) in 85% perdeuteriated orthophosphoric acid, D3PO4/D2O, has been carried out and the ratio of the decarboxylation rate constants, k(H2O)/k(D2O) equal 1.88š0.07, interpreted as caused by different dissociation constants, Kh/Kd, of normal and perdeuteriated phosphoric acids in H2O and in D2O...
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