Convenient direct syntheses of novel fused-ring CB4N5 systems by nitrile hydroboration†

Abstract

Reactions between B₂H₆ or BH₃·thf (thf = tetrahydrofuran) and nitriles RCN (R = Me, Et, Bu^t or CH₂F), previously known to generate borazines (RCH₂NBH)₃ have been found to generate also 25–37% yields of novel carboraza bicyclic systems related to dihydronaphthalene, H₃B₄N₅(RCH₂)₄CHR, thus affording for the first time a direct route from commercially available acyclic reagents into mixed carbon–boron–nitrogen heterocyclic chemistry.