摘要:
Treatment of the new boronous acid HOB(fmes)(2) (1) (fmes = 2,4,6-(CF3)(3)C6H2) with n-butyllithium in diethyl ether/pentane affords after work-up the dimer [Li(thf)OB(fmes)(2)](2) (2). Reaction of [Mo-2(NMe2)(6)] with two equivalents of 1 in toluene gives the amido-boroxide complex Mo-2(NMe2)(4)[OB(fmes)(2)](2) (3). Treatment of CuBr2 with LiOB(Mes)(2) (mes = 2,4,6-Me3C6H2) in tetrahydrofuran affords after work-up and addition of excess pyridine the monomeric copper(II) boroxide {Cu[O3B2(mes)(2)](2)[Li(CH3CN)(C5H5N)](2)} (4), containing the new ligand mesB(O)OB(O)mes, as a result of loss of mesitylene and formation of a B--O--B bond. 2 and 4 have been structurally characterized. (C) 1997 Elsevier Science Ltd.