Decamethyltitanocene dichloride

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Decamethyltitanocene dichloride
Cp*2TiCl2.svg
PMCPTI.svg
Names
Other names
Bis(Pentamethylcyclopentadienyl)titanium dichloride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.149.726 Edit this at Wikidata
  • InChI=1S/2C10H20.2ClH.Ti/c2*1-6-7(2)9(4)10(5)8(6)3;;;/h2*6-10H,1-5H3;2*1H;/q;;;;+2/p-2
    Key: HWBFYOZNVALDJL-UHFFFAOYSA-L
  • C[C-]1C(=C(C(=C1C)C)C)C.C[C-]1C(=C(C(=C1C)C)C)C.[Cl-].Cl[Cl-][Ti+4]
Properties
C20H30Cl2Ti
Molar mass 389.23 g·mol−1
Appearance red solid
Density 1.32 g/cm3
Melting point 190 °C (374 °F; 463 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Decamethyltitanocene dichloride is an organotitanium compound with the formula Cp*2TiCl2 (where Cp* is C5(CH3)5, derived from pentamethylcyclopentadiene). It is a red solid that is soluble in nonpolar organic solvents. The complex has been the subject of extensive research. It is a precursor to many organotitanium complexes. The complex is related to titanocene dichloride, which lacks the methyl groups.

Synthesis and reactions[edit]

The complex is prepared by the reaction of titanium tetrachloride with LiCp*. An intermediate in this synthesis is (pentamethylcyclopentadienyl)titanium trichloride.

Reduction of Cp*2TiCl2 in the presence of ethylene gives the adduct Cp*2Ti(C2H4).[1] The analogous Cp compound has not been prepared, a contrast that highlights the advantages of the Cp* ligand. This pentamethylcyclopentadienyl (Cp*) species undergoes many reactions such as cycloadditions of alkynes.[2]

The dicarbonyl complex Cp*2Ti(CO)2 is prepared by reduction of Cp*2TiCl2 in the presence of carbon monoxide.[3]

Further reading[edit]

  • Rosenthal, U.; et al. (2000). "What Do Titano- and Zirconocenes Do with Diynes and Polyynes?". Chemical Reviews. 33: 119–129. doi:10.1021/ar9900109. PMID 10673320.

References[edit]

  1. ^ Cohen, Steven A.; Auburn, Pamela R.; Bercaw, John E. (1983). "Structure and Reactivity of Bis(pentamethylcyclopentadienyl)(ethylene)titanium(II), a Simple Olefin Adduct of Titanium". Journal of the American Chemical Society. 105 (5): 1136–1143. doi:10.1021/ja00343a012.
  2. ^ *Buchwald, S. L.; Nielsen, R. B. (1988). "Group 4 Metal Complexes of Benzynes, Cycloalkynes, Acyclic Alkynes, and Alkenes". Chemical Reviews. 88 (7): 1047–1058. doi:10.1021/cr00089a004.
  3. ^ Sikora, David J.; Moriarty, Kevin J.; Rausch, Marvin D. (1990). Dicarbonylbis(η5 -Cyclopentadienyl) Complexes of Titanium, Zirconium, and Hafnium. Inorganic Syntheses. Vol. 28. pp. 248–257. doi:10.1002/9780470132593.ch64. ISBN 9780470132593.