Reactivity of the bridged borylene complex [μ-BCl{η 5-C 5H 4Me)Mn(CO) 2} 2

Abstract

The reactivity of the bridged chloro borylene complex [μ-BCl{(η 5-C 5H 4Me)Mn(CO) 2} 2] ( 2a) towards various protic reagents was studied. Reaction of 2a with isopropanol yielded the alkoxy borylene complex [μ-BO iPr{(η 5-C 5H 4Me)Mn(CO) 2} 2] ( 3d) in very high yield. A further series of protic reagents HX (X=HS −, BF 4 −, Co(CO) 4 −) gave, in the presence of pyridine, the new amino borylene complex [1-(μ-B)-4-H-(NC 5H 5){(C 5H 4Me)Mn(CO) 2} 2] ( 5a), which represents the product of an unprecedented 1,4-hydroboration of pyridine. Complex 5a was fully characterised in solution by multinuclear NMR studies, in the solid state by X-ray diffraction, and was also subject to DFT-studies.