Reactions of bis(η 5-cyclopentadienyl)titanium(III) compounds with isocyanides

Abstract

Reactions of Cp 2TiR (R = Cl, C 6F 5, C 6H 5, o-CH 3C 6H 4) with R′NC (R′ = o-CH 3C 6H 4, 2,6-(CH 3) 2C 6H 3) give two types of products: terminally coordinated adducts, Cp 2TiR · CNR′, and insertion products, Cp 2TiC(R)NR′, i.e. iminoacyl derivatives. Insertion of the isocyanide group into the TiR bond was followed by IR spectroscopy for Cp 2Ti- o-CH 3C 6H 4 · 2,6-(CH 3 2C 6H 3NC. The iminoacyl compounds are readily oxidized by X 2 (X = I, SC 6H 5) to give Cp 2Ti(X)C(R)NR′. The CN group in the latter compound is η 2-coordinated to titanium.