ISOTOPE EFFECTS IN THE THERMAL DEAMMONATION OF PHTHALAMIDE

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Abstract
A study has been made of the nitrogen isotope effects occurring in the deammonation of phthalamide of normal isotopic abundance. It has been found that the reaction of phthalamide-N14N15leading to N14H3formation occurs 1.2% more readily than that giving N15H3. In addition, a 0.6% greater probability of formation of N14H3from phthalamide-N14,N15than from phthalamide-N14,N14has been observed, due consideration being given to the presence of one N14atom in the former and two N14atoms in the latter amide species. An explanation has been advanced based on the effect upon activation energy of the isotopic mass of the nitrogen atom in the C–N bonds broken and formed in the reaction.