On the track of novel triel-stabilised silylaminoiminoborenes.

Reactions between the halogen triels AlClMe2, AlBr3, GaCl3 and the silylaminofluoroboranes (Me3Si)(2)N-B(F)NRSiMe3 (R=SiMe3, CMe3) afforded the silylaminoiminoborenes, which were isolated as the triel adducts, such as Me3Si(Cl3Ga)NB-NRSiMe3 (6). In order to extent this reaction path to other fluoroboranes, novel aryl- and silyl-substituted diaminofluoroboranes were synthesised. Because almost no open-chain diaminofluoroboranes had been structurally characterised previously, corresponding fluoroboranes containing no silyl groups were crystallised for purposes of comparison. In complex reactions with the arylsilylaminofluoroboranes [(2,6-(iPr)(2)C6H3)(Me3Si)NB(F)NR2, R=iPr, iBu], amine adducts of borenium salts such as [(iPr)(2)NH -> B(Bu)NH-2,6-(iPr)(2)C6H3]+AlCl4- (13) were obtained.