Reactivity of a Platinum Iminoboryl Complex toward Lewis and Bronsted Acids

摘要

Recently, research in our laboratory focused on the interaction of bromoboranes with [Pt(PCy_3)_2] (1), leading to the isolation of a number of unusual platinum complexes, such as a cationic T-shaped platinum boryl species, a cationic base-stabilized borylene complex, and a cationic terminal borylene compound. Furthermore, we recently reported the straightforward formation and full characterization of the iminoboryl complex trans-[(PCy_3)_2Pt(B≡NSiMe_3)-(Br)] (2), obtained upon B—Br bond oxidative addition of (Me_3-Si)_2NBBr_2 to 1 and subsequent Me_3SiBr elimination at room temperature. Iminoboranes, RB≡NR', are highly reactive compounds by virtue of their polar, unsaturated nature. As a result, in the absence of sterically encumbering substituents on either side of the B≡N triple bond, these species are prone to cyclooligomer-ization or polymerization. Differently from typical iminoboranes, 2 displays a remarkable stability against oligomerization.