摘要:
Borenium ions do not accumulate under the conditions of hydride abstraction from Lewis base borane complexes (L center dot BH3) using trityl cation because subsequent rapid reaction with L center dot BH3 occurs to form B-H-B bonds. The hydride-bridged cations are sufficiently stabilized to resist abstraction of the remaining hydride by excess trityl cation; however, reversible cleavage of the 3c2e bond does take place to release borenium ion equivalents, as evidenced by interaction with weak nucleophiles.