Collect. Czech. Chem. Commun. 2000, 65, 192-202

Synthesis and Structure of (π-Arene)titanium(II) Haloaluminate Complexes with Diarylmethane Ligands

Volkmar Kupfera,*, Karel Machb and Ulf Thewalta

a Sektion für Röntgen- und Elektronenbeugung, Universität Ulm, 89069 Ulm, Germany
b J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic


Novel (arene)titanium(II) haloaluminate complexes (η6-arene)Ti[(μ-X)2AlX2]2 (X = Cl, Br) were obtained from (η6-benzene)Ti[(μ-X)2AlX2]2 (X = Cl, Br) complexes by ligand exchange reactions with bis(pentamethylphenyl)methane and dimesitylmethane. The [η6-1,2,3,4,5- pentamethyl-6-(2,3,4,5,6-pentamethylbenzyl)benzene]Ti[(μ-X)2AlX2]2 (X = Cl, Br) and [η6-1,3,5- trimethyl-2-(2,4,6-trimethylbenzyl)benzene]Ti[(μ-Br)2AlBr2]2 complexes containing titanium coordinated to only one of the two phenyl rings were obtained and their crystal structures were determined. (η6-Benzene)Ti[(μ-Cl)2AlCl2]2 and dimesitylmethane afforded the (η6-mesi- tylene)Ti[(μ-Cl)2AlCl2]2 complex which is isotypic with the known bromo analogue. This product shows that Friedel-Crafts scission of aryl-alkyl bonds occurs in such systems even under mild conditions.

Keywords: Arene complexes; Titanium; Haloaluminates; Diarylmethane ligands; Crystal structure; X-Ray diffraction.

References: 26 live references.