Abstract
Titanium(IV) chloride and bromide form complexes TiX 4(Me 2C N N CMe 2) 2 in the presence of excess of acetone azine. When the halides are in excess, the products formed are (TiCl 4) 4(Me 2C N N CMe 2) 3 and TiBr 4(Me 2C N N CMe 2). Titanium(III) chloride isomerises acetone azine to 3, 5, 5-trimethyl-2-pyrazoline catalytically at 100 °C; titanium(III) is oxidised to titanium(IV) under these conditions or upon long standing at room temperature and the complex [TiCl 3(Pz′)Pz0 3] can be isolated (Pz = 3, 5, 5-trimethyl-2-pyrazoline; Pz′–H).
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