Unprecedented reactivity of the bridged borylene complexes [mu-BCl((eta(5)-C(5)H(4)Me)Mn(CO)(2))(2)] toward pyridine.

Abstract

The reactivity of the bridged chloroborylene complex [mu-BCl((eta(5)-C(5)H(4)Me)Mn(CO)(2))(2)] (1) toward pyridine was investigated under various conditions. In the presence of protic reagents such as H[Co(CO)(4)] or H[BF(4)], the formation of the aminoborylene complex [1-(mu-B)-4-H-(NC(5)H(5))((C(5)H(4)Me)Mn(CO)(2))(2)] (2) was observed. Compound 2 represents the product of an unprecedented formal 1,4-hydroboration of pyridine. Corresponding reactions of 1 with pyridine and Tl[PF(6)] afforded 2 in similar yields, thus providing evidence that the abstraction of the boron bound chloride initiates the observed reaction. Complex 2 was fully characterized in solution and in the crystal.