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Titanium tetrachloride
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===Organometallic chemistry=== {{Main|Organotitanium compound}} The [[organometallic chemistry]] of titanium typically starts from {{chem2|TiCl4}}. An important reaction involves sodium [[cyclopentadiene|cyclopentadienyl]] to give [[titanocene dichloride]], {{chem2|TiCl2(C5H5)2}}. This compound and many of its derivatives are precursors to [[Ziegler–Natta catalyst]]s. [[Tebbe's reagent]], useful in organic chemistry, is an aluminium-containing derivative of titanocene that arises from the reaction of titanocene dichloride with [[trimethylaluminium]]. It is used for the "olefination" reactions.<ref name="organoti" /> [[Arene]]s, such as {{chem2|C6(CH3)6}} react to give the [[sandwich complex|piano-stool complex]]es {{chem2|[Ti(C6R6)Cl3]+}} (R = H, {{chem2|CH3}}; see figure above). This reaction illustrates the high Lewis acidity of the {{chem2|TiCl3+}} entity, which is generated by abstraction of [[chloride]] from {{chem2|TiCl4}} by [[aluminium trichloride|{{chem2|AlCl3}}]].<ref name="TiCplx">{{cite journal|first1=F. |last1=Calderazzo |first2=I. |last2=Ferri |first3=G. |last3=Pampaloni |first4=S. |last4=Troyanov |title= ''η''<sup>6</sup>-Arene Derivatives of Titanium(IV), Zirconium(IV) and Hafnium(IV)|journal=J. Organomet. Chem.| year=1996| volume=518|issue=1–2 | pages=189–196|doi= 10.1016/0022-328X(96)06194-3}}</ref>
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