Binuclear Boron Complexes Containing Boron-Nitrogen Bonds

Abstract

The 1:1 and 1:2 molar ratio reactions of oxybis(diacetoxyborane) with 3-(hydroxyalkyl or aryl)amino-1-phenyl-2-butene-1-one (I) of the general formula C₆H₅COCHC(CH₃):NHR′OH (where R′ = -CH₂CH₂−, -CH₂HCH₃ and -C₆H₄−) in dry toluene have led to the formation of LB-O-B(OAC)₂ and (LB)₂O type of compounds (where L⁻² represents the anion of ligand I)’. Further, equimolar reactions of LB-O-B(OAC)₂ with 1,2-dihydroxybenzene or 2-methylpentane-2, 4-diol have resulted in the isolation of mixed ligand complexes of boron. IR and ¹H nmr studies indicate the presence of N→B bonds and molecular weight determinations show these compounds to be monomers in boiling chloroform.