لخّصلي

Titanium, a plentiful and non-toxic transition metal, is often used in modifying organolithium and organomagnesium compounds. Titanium reagents are typically prepared by ligand exchange reactions using TiCl4, Ti(OiPr)4, or cyclopentadienyl-titanium trichloride. Chloride ligands can be substituted with various ligands, including protonated, silylated, stannylated, or metalated ones. Volatile byproducts are removed through evaporation, while alkoxide ligands can be exchanged by forming adducts with alcohols. Many titanium compounds are sensitive to moisture, reacting to form acidic hydroxo compounds which then dimerize or trimerize into μ-oxo structures. Excess water leads to complete hydrolysis, producing titanium dioxide. This section highlights recent advancements in utilizing organotitanium compounds for organic synthesis.

Titanium, an abundant and non-toxic transition metal, has been often used for the modification of organolithium and organomagnesium compounds. The preparation of individual titanium reagents is usually carried out by ligand exchange on, e.g. TiCl4 , Ti(OiPr)4 or cyclopentadienyl-titanium trichloride (Scheme 1). Chloride ligands can be replaced by protonated (LH), silylated (LSiMe3), stannylated (LSnR3) or metalated (LM, M = Li, MgX) ligands. Volatiles such as HCl and Me3SiCl can be removed by evaporation. Alkoxide ligands can be exchanged through adduct formation with alcohols. Many of the titanium compounds are moisture sensitive. The resulting hydroxo compounds are acidic and form μ-oxo dimers or trimers. With more water, complete hydrolysis occurs to give titanium dioxide. This section covers the recent developments on the use organotitanium compounds in organic synthesis.