Neutral rearrangement between boryl and silyl groups in B-halogenosubstituted boryl-bis (silyl) hydroxylamines

Dihalogenboranes, RBX2, react with lithiated N,O-Bis(trimethylsilyl)hydroxy lamine to give B-halogeno-borylhydroxylamines RB(X)ON(SiMe3)(2): X = F, R = Trip (Trip = 2,4,6-triisopropylphenyl) (Ia), N(SiMe3)2 (Ib), N(CHMe2)(2) ( Ic), N(SiMe3)Dip (Dip = 2,6-diisopropylphenyl) (Id) and X = Cl, R = N(SiMe3 )(2) (Ie). Depending upon the substituents on the boron atom a dyotropic re arrangement can be effected which transforms the compounds Ia, Ib und Ie in to the isomeric borylhydroxylamines RB(X)N(SiMe3)OSiMe3 IIa, IIb and IIe. T he compounds are characterized by their m.s. and n.m.r. (H-1, B-11, C-13, F -19, Si-29) spectra and by elemental analyses.