Fluoroarene Complexes with Small Bite Angle Bisphosphines: Routes to Amine−Borane and Aminoborylene Complexes

Fluoroarene complexes of the small bite angle bisphosphine Cy2PCH2PCy2 (dcpm) have been prepared: [Rh(dcpm)(η6-1,2−F2C6H4)][Al{OC(CF3)3}4] and [Rh(dcpm)(η6-1,2,3− F3C6H3)][Al{OC(CF3)3}4]. These complexes act as precursors to a previously inaccessible σ−amine−borane complex [Rh(dcpm)(η2-H3B·NMe3)][Al{OC(CF3)3}4] of a small bite-angle phosphine. This complex is a poor catalyst for the dehydrocoupling of H3B·NMe2H. Instead, formation of the bridging borylene complex [{RhH(µ−dcpm)}2(µ−H)(µ−BNMe2)][Al{OC(CF3)3}4] occurs, which has been studied by NMR, mass spectrometry, crystallographic and DFT techniques. This represents a new route to bridging borylene complexes.

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