Abstract
The title compound, [Ti(C24H33O2)Cl3(C4H8O)], is a rare example of a trigonal-bipyramidal titanium coordination complex with three chloride and two oxygen donor ligands. The asymmetric unit contains two independent mol-ecules having essentially the same conformation. The mol-ecules feature the titanium(IV) metal cation complexed with three chloride ligands, a tetra-hydro-furan mol-ecule, and one oxygen atom from the resolved ligand precursor (R)-(+)-5,5',6,6'-tetra-methyl-3,3'-di-t-butyl-1,1'-biphenyl-2,2'-diol, where the remaining phenolic hydrogen atom engages in inter-molecular O-H⋯Cl hydrogen bonding. In one mol-ecule, the THF ligand is disordered over two orientations with refined site occupancies of 0.50 (3).
Highlights
Bipyramidal titanium coordination complex with three chloride and two oxygen donor ligands
Metal cation complexed with three chloride ligands, a tetrahydrofuran molecule, and one oxygen atom from the resolved ligand precursor (R)-(+)-5,50,6,60 tetramethyl-3,30 -di-t-butyl-1,10 -biphenyl-2,20 -diol, where the remaining phenolic hydrogen atom engages in intermolecular O—H Cl hydrogen bonding
In work aimed at preparing new titanium asymmetric Lewis acid catalysts, the title compound was obtained as a crystalline solid from tetrachloridobis(tetrahydrofuran)titanium(IV) and the BINOL ligand (R)-(+)-5,50,6,60 -tetramethyl-3,30 -di-t-butyl-1,10 -biphenyl-2,20 diol (BIPHEN)
Summary
Asymmetric Lewis acid catalysis with titanium coordination compounds featuring chiral ligands for the selective synthesis of resolved small molecule organic compounds is a well established field of chemistry (Ramón & Yus, 2006). Chiral diol ligands such as 1,10 -bi-2-naphthol (BINOL) and 2,2dimethyl-,,0 ,0 -tetraphenyl-1,3-dioxolane-4,5-dimethanol (TADDOL) are two ligand types that have seen frequent use (Baker-Salisbury et al, 2014). In work aimed at preparing new titanium asymmetric Lewis acid catalysts, the title compound was obtained as a crystalline solid from tetrachloridobis(tetrahydrofuran)titanium(IV) and the BINOL ligand (R)-(+)-5,50 ,6,60 -tetramethyl-3,30 -di-t-butyl-1,10 -biphenyl-2,20 diol (BIPHEN). The complex, [BIPHEN-1O]TiCl3(THF), is a rare example of a trigonal–bipyramidal coordination geometry for titanium(IV), with a Chemical Bonding Classification (CBC) designation of TiLX4 (Green, 1995)
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