Unusual addition of but-2-yne to a permethyltitanocene species

Abstract

The [TiCl2(eta(5)-C5Me5)(2)]MG(excess)/tetrahydrofuran system reacts with but-2-yne in excess to give paramagnetic (eta(5): eta(1)-1,2,3,4-tetra-methyl-5-(2,3,4,5-tetramethylpenta-2,4-dien-1,5-diyl-kappa C5)cyclopentadienyl)(eta(5)-pentamethylcyclopentadienyl)titanium(III) (1) as the main product. The crystal structure of 1 shows a minimum steric hindrance between the methylated cyclopentadienyl ligands and non-coplanar conjugated double bonds in the C-5 tether.

Keywords

• titanium
• permethyltitanocene
• but-2-yne
• insertion
• titanium(III) complex
• ESR spectra
• X-ray crystallography
• to-tail dimerization
• crystal-structure
• titanocene dichlorides
• acetylenes
• hydrogenation
• bis(pentamethylcyclopentadienyl)titanium(II)