A COMPARATIVE STUDY ON THE HYDROGEN-TRITIUM ISOTOPES EXCHANGE EFFICIENCY WITH METALLIC CATALYSTS IN THE LABELLING ~3H-TETRAMETHYL-PYRAZINE

Experimental results of catalyzed-labelling of tetramethylpyrazine by means of Pt-black, Pd-black and RhCl3 are obtained It is found that efficiency of the hydrogen-tritium isotopes exchange decreases in the order of Pt- blaek> RhCl3>Pd-black, but that of the 3H-H isotopes exchange increases in the order of Pt-black