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N,N′-Bis(trimethylsilyl)benzamidinato complexes of vanadium(V), niobium(V) and tantalum( V) have been prepared starting from  t BuN=MCl 3  · n py and  t BuN=MCpCl 2 , respectively:  t BuN=V[PhC(NSiMe 3 ) 2 ]  n Cl 3 -n (n = 1, 2);  t BuN=M[RC(NSiMe 3 ) 2 ]Cl · py [M = Nb. Ta; R = C 6 H 5 , C 6 H 4 (4-CF 3 )];  t BuN=MCp[RC(NSiMe 3 ) 2 ]Cl [M = V. Nb, Ta; R = C 6 H 5 , C 6 H 4 - (4-CF 3 )];  t BuN=VCp[PhC(NSiMe 3 ) 2 ](O t Bu). The syntheses of silylated tert-butylamido complexes tBuN=M[NtBu-SiMe 2 -NH t Bu]Cl 2  · py (M = Nb, Ta),  t BuN=V[N t Bu-SiMe 2 -O t Bu]Cl 2  and  t BuN=M[N t Bu-SiMe 2 -O t Bu]Cl 2  · py [M = Nb, Ta (20)] are also described. The compounds have been investigated by  1 H NMR data, 51 V NMR data, mass spectra. X-ray data diffraction analysis.

zeitschrift für naturforschung b

N,N′-Bis(trimethylsilyl) benzamidinato-Komplexe von Vanadium(V), Niob(V) und Tantal(V)/ N,N′-Bis(trimethylsilyl)benzamidinato Complexes of Vanadium(V), Niobium(V) and Tantalum(V)