SEARCH Articles Figures Tables Pyrimidine positional reactivity Pyrimidines relative reactivity Pyrimidines typical reactivity Pyrimidines, alkyl-, reactivity Pyrimidines, alkyl-, reactivity basicity Pyrimidines, alkyl-, reactivity nucleophilic substitution Typical Reactivity of the Diazine Pyridazine, Pyrimidine and Pyrazine Typical reactivity of the diazines pyridazine, pyrimidine and pyrazine