Functionalizations of the boranato group of phosphine-boranes have been investigated. Trimethylphosphine-borane readily reacted with methanesulfonic acid in dichloromethane with evolution of hydrogen. The resulting trimethylphosphine-methylsulfonyloxyborane was subjected to nucleophilic substitution reaction on the boron atom with arenethiols or secondary phosphine-boranes in the presence of NaH. The reactivities of the substitution products obtained were also investigated. A new phosphine-borane having a P-B-P-B-P-BP-B bond linkage was synthesized.
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