James E. Douglass

Some bis-amine complexes of boronium ions with bulky substituent of boron

Abstract The reaction of iodine with pyridine(1,1,3-trimethylpropyl)borane and pyridinedicylohexylborane in the presence of excess pyridine is anomalous when compared with previous work with the reaction involving less bulky substituents on boron: a mixture of products was obtained from which the complex ion, R 2 bis(pyridine)boron(III) + , could not be isolated. However, in the absence of excess pyridine iodine reacts with the pyridine boranes to afford the unstable pyridine iodoboranes, which react with pyridine to afford the bis-amine complexes. The dicyclohexylbis(pyridine)boron(III) cation was found to dehydroborate under relatively mild conditions to give the cyclohexylhydridobis(pyridine)boron(III) cation.