Titanocene dichloride

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Structural formula
Structural formula of titanocene
General
Surname Titanocene dichloride
other names
  • Dichloridobis (cyclopentadienyl) titanium (IV)
  • Bis (η 5 -cyclopentadienyl) titanium dichloride
Molecular formula C 10 H 10 Cl 2 Ti
Brief description

red, odorless solid

External identifiers / databases
CAS number 1271-19-8
EC number 215-035-9
ECHA InfoCard 100,013,669
PubChem 5284468
ChemSpider 34981141
Wikidata Q412805
properties
Molar mass 248.98 g mol −1
Physical state

firmly

density

1.6 g cm −3

Melting point

289-290 ° C

solubility

Decomposes in water

safety instructions
GHS labeling of hazardous substances
07 - Warning

Caution

H and P phrases H: 315-335
P: 261
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Titanocene dichloride (dichlorobis (cyclopentadienyl) titanium (IV)), with the semi-structural formula [Ti (Cp) 2 Cl 2 ] or also [Ti (C 5 H 5 ) 2 Cl 2 ], is a metallocene-like compound, that is, an organometallic compound with aromatic ring systems . The central titanium (IV) ion is in this case tetrahedrally two cyclopentadienyl rings and two chloride ligands surrounded. Due to its reactivity with water and sensitivity to oxidation, it must be stored under argon or, even better, in a vessel that has first been evacuated and then filled with argon (for example a Schlenk tube ).

Solid titanocene dichloride

use

Titanocene dichloride can be used as a homogeneous catalyst in a Ziegler-Natta- like polymerization. Common monomers are e.g. B. styrene or propene . The Tebbe reagent used for methylenation can be prepared from titanocene dichloride.

Formation of the Tebbe reagent from titanocene dichloride and further reaction to form carbene

history

First synthesis by Ernst Otto Fischer and Geoffrey Wilkinson . In 1973 they received the Nobel Prize for Chemistry for their work on organometallic compounds , which also explained the bonding in so-called metallocenes .

Individual evidence

  1. ↑ a b c d data sheet titanocene dichloride from AlfaAesar, accessed on February 5, 2010 ( PDF )(JavaScript required) .
  2. ↑ a b Data sheet bis (cyclopentadienyl) titanium (IV) dichloride from Sigma-Aldrich , accessed on April 24, 2011 ( PDF ).