Preparation and crystal structure of tris(2-methylphenyl)silanolatotantalum tetrachloride–1.5 diethyl ether and isolation of the novel tantalum(IV) derivative hexamethylbis[tris(2-methylphenyl)silanolato]ditantalum

Abstract

The tantalum(V) compound tris(2-methylphenyl)silanolatotantalum tetrachloride–1.5-diethyl ether [(2-MeC₆H₄)₃SiOTaCl₄·1.5 (Et₂O)](1) has been prepared and structurally characterised; on treatment with methylmagnesium chloride (4 equiv.)(1) gave solutions containing the apparently unstable tetramethyl derivative [(2-MeC₆H₄)₃ SiOTaMe₄]A and its decomposition product hexamethylbis[tris(2-methylphenyl)silanolato]ditantalum, [(2-MeC₆H₄)₃ SiOTaMe₃]₂(2), from which pure (2) was isolated.