Synthesis of boron-containing heterocyclic compounds

The synthesis of boron-containing 1,3,5-triazines and 1,2,4-triazines is described. Derivatives of 1,3,5-triazine containing the o-carborane cluster have been obtained by reacting the corresponding propargyl derivatives with B10H14. Derivatives of 1,2,4-triazine containing the B12H122− cluster have been obtained by nucleophilic substitution of ethylsulfone derivatives with B12H11SH2–. They have been isolated in their ring-protonated form. Reaction of RNH2-B8H11NH-R with stericly demanding heterocycles failed, either for steric or for solubility reasons.