Bis(cyclopentadienyl)zirconium(IV) dichloride

Synonym: Di(cyclopentadienyl)zirconium(IV) dichloride, Dichlorodicyclopentadienylzirconium, Dichlorozirconocene, Zirconium dicyclopentadiene dichloride, Zirconocene dichloride, Cp2ZrCl2

CAS Number 1291-32-3 | MDL Number MFCD00003726 | EC Number 215-066-8

Cp2ZrCl2 chemical structure

Product codeZR1323
CAS number1291-32-3
Assay (purity)98%+
Purity methodby gravimetric assay: %Zr=30.6.–31.8 (after ignition to oxide)
IRconforms to structure
Molecular weight292.32 g/mol
Appearancewhite powder
Molecular formulaC10H10Cl2Zr
Linear formula(C5H5)2ZrCl2
Packagingglassware/metal containers/bubblers

Bis(cyclopentadienyl)zirconium(IV) dichloride is used as a catalyst of the carboalumination of alkynes by trimethylaluminum to give an (alkenyl)dimethylalane, a versatile intermediate for further cross-coupling reactions for the synthesis of stereodefined trisubstituted olefins. This product can also be applied to prepare the Negishi reagent, Cp2Zr(η2-butene), which can be used as a source of Cp2Zr in oxidative cyclization reactions. Also, Cp2ZrCl2 reacts with lithium aluminum hydride to give Cp2ZrHCl Schwartz’s reagent. The Cp2ZrCl2/C2H5AlCl2 system was found to be an active catalyst for the polymerization of alkynes. See links below

Ereztech manufactures and sells this product in small and bulk volumes. Glass ampules, bottles or metal ampules or bubblers are available for packaging. For additional analytical information or details about purchasing ZR1323 contact us at

Safety information

UNNot regulated
Hazardous classNot regulated
Packing groupNot regulated
Signal wordWARNING
Hazard statementsH315-H319-H335
Precautionary statementsP261-P305 + P351 + P338
Transport descriptionNONH for all modes of transport
In TSCA registryYes

First Aid Measures

General adviceConsult a physician. Show this safety data sheet to the doctor in attendance. Move out of the dangerous area.
Eye contactRinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Skin contactWash off with soap and plenty of water. Consult a physician.
InhalationIf breathed in, move person into the fresh air. If not breathing, give artificial respiration. Consult a physician.
If swallowedDo NOT induce vomiting. Never give anything by mouth to an unconscious person. Rinse mouth with water. Consult a physician.


Certificates of Analysis (CoA)

If you don’t see the needed lot of Bis(cyclopentadienyl)zirconium(IV) dichloride below please contact customer support at

Lot# 018/139 Lot# 018/142 Lot# 0026/100 Lot# 018/153 Lot# 026/105 Lot# 029/233 Lot# 023/311

External identifiers for Cp2ZrCl2

Pubchem CID10891641
IUPAC Namecyclopentane;dichlorozirconium
InchI IdentifierInChI=1S/2C5H5.2ClH.Zr/c2*1-2-4-5-3-1;;;/h2*1-5H;2*1H;/q;;;;+2/p-2

Known applications and external links

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Ereztech synthesizes and sells additional ZR-compounds.

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