Syntheses of all five of the singly labeled [(15)N]adenines are now provided. The presence or absence of two-bond (15)N-(1)H spin couplings in their (1)H NMR spectra confirm the location of the isotope in each case. The fragmentation patterns in their mass spectra are indicative of the sequential losses of HCN units and of CH(2)N(2) from adenine upon electron impact.
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Barrio et al. (1981) studied this question.
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