Crystal structures of twoansa-titanocene trifluoromethanesulfonate complexes bearing the Me₂Si(C₅Me₄)₂ligand

Abstract

The crystal structures of two ansa-titanocene tri­fluoro­methane­sulfonate complexes bearing the Me2Si(C5Me4)2 ligand are reported. Both complexes display a bent metallocene unit, the metal centre is coordinated in a distorted tetra­hedral geometry.

From Coordination to Noncoordination: Syntheses and Substitution Lability Studies of Titanium Triflato Complexes

“…14−16 Although there are many examples of Ti(IV) triflato complexes, the number of Ti(III) triflato complexes is very limited. 17,18 One of the rare examples, namely Cp* 2 Ti-(OTf), was synthesized by oxidation of a Cp* 2 Ti(acetylene) complex with Fe(OTf) 3 and was used to study water splitting reactions. 19 Another Ti(III) triflato complex (Cp 2 Ti(OTf)-(THF)) was described earlier by Berhalter and Thewalt, 20 however, this complex was not further studied and is to date the only example of a Cp 2 Ti(III) triflato complex.…”

“…Despite its early synthesis, this complex is of recent interest in catalytic studies of radical arylation reactions and tetrahydrofuran synthesis and an improved, silver-free synthesis route was developed . Since the first synthesis of the titanocene­(IV)­triflato complex, various chiral titanocene-based complexes have been used to perform catalytic, enantioselective reactions. − Although there are many examples of Ti­(IV) triflato complexes, the number of Ti­(III) triflato complexes is very limited. , One of the rare examples, namely Cp* 2 Ti­(OTf), was synthesized by oxidation of a Cp* 2 Ti­(acetylene) complex with Fe­(OTf) 3 and was used to study water splitting reactions . Another Ti­(III) triflato complex (Cp 2 Ti­(OTf)­(THF)) was described earlier by Berhalter and Thewalt, however, this complex was not further studied and is to date the only example of a Cp 2 Ti­(III) triflato complex.…”