Synthesis and reactions of some tris(2-methylphenyl)silanolatometal compounds. Crystal and molecular structures of [Ta{OSi(C6H4Me-2)3}Cl4]·1.5Et2O and [Ta{OSi(C6H4Me-2)3}Me3Cl]
作者： Simon G. Bott , Muhammed A. Mazid , Michael B. Hursthouse , Alice C. Sullivan
DOI: 10.1039/DT9910000355
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摘要: The reactions of HfCl4, NbCl5, TaCl5 and WCl6 with Li[OSi(C6H4Me-2)3] in 1 : molar ratios afforded the compounds [Hf{OSi(C6H4Me-2)3}Cl4]·Li(Et2O)21, [Nb{OSi(C6H4Me-2)3}Cl4]·1.5Et2O 2, [Ta{OSi(C6H4Me-2)3}Cl4]·1.5Et2O 3 Si(C6H4Me-2)3Cl respectively. MgMeX (X = Cl or l) under a range conditions were explored. Thus [Ta{OSi(C6H4Me-2)3}Me3X]4(X Cl), corresponding isomorphous mixture 4a having chloride iodide present ratio 2 1, [{Ta[OSi(C6H4Me-2)3]Me3}2]5 [Ta{OSi(C6H4Me-2)3}2Me2Cl]6 have been prepared characterised. Compound 6 was also form [Ta{OSi(C6H4Me-2)3}2Cl3]7. X-Ray structures compound 3, determined. is octahedral siloxy ether groups mutually trans Ta–O distances 1.812(3)(siloxy) 2.263(3)A(ether); Ta–Cl 2.328–2.356(1). five-co-ordinate trigonal bipyramidal halide axial: 1.1856(5), Ta–Cl/l 2.37(1)/2.674(6), equatorial Ta–C 2.11–2.17(1)A.
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