Synthetic and structural chemistry of amidinate-substituted boron halides

The following new amidinate-substituted boron halides are reported: PhC{N(SiMe(3))}(2)]BCl(2)(6), MeC{NCy}(2)]BCl(2)(10), Mes*C{NCy}(2)]BCl(2)(11), MeC{N(i)Pr}(2)]BCl(2)(12), and FcC{NCy}(2)]BBr(2)(13). Compound 6 was prepared via the trimethylsilyl chloride elimination reaction of BCl(3) with N,N,N'-tris(trimethylsilyl)benzamidine, and compounds 10-12 were prepared by salt metathesis between the lithium amidinates RC(NR')(2)]Li and BX(3). Compound 13 was prepared via the insertion of 1,3-dicyclohexylcarbodiimide into the B-C bond of ferrocenyldibromoborane FcBBr(2). The molecular structures of 6, 10, 11, 13 and the known compound PhC{N(SiMe(3))}(2)]BBr(2)(1) were established by single-crystal X-ray diffraction.