NEW BORYLENE COMPLEXES OF THE TYPE [MU-BX((ETA(5)-C5H5ME)MN(CO)(2))(2)] - SUBSTITUTION-REACTIONS AT THE METAL-COORDINATED BORYLENE MOIETY

The reaction of the air-and water-stable borylene complex [mu-BNMe2({e ta(5)-C5H4Me)Mn(CO)(2)}(2)] (1a) with a solution of HCl in Et2O afford s the corresponding chloroborylene complex l(eta(5)-methylcyclopentadi enyl)manganese)(Mn-Mn)] (2), This compound easily undergoes further su bstitution reactions with protic reagents such as primary amines, alco hols and water at the metal coordinated borylene moiety with eliminati on of HCl, giving new products of the type [mu-BX{(eta(5)-C5H4Me)Mn(CO )(2)}(2)] (3a, b: X = NHtBu, NHPh; 4a, b: X = OMe, OEt; 5: X = OH). Al l borylene complexes were isolated as crystalline solids in good yield s and characterized by multinuclear NMR methods and IR spectroscopy in solution, In addition, the structure of 4b in the crystalline state w as determined by a single-crystal X-ray study.