Bis(cyclopentadienyl)chromium(II)
Bis(cyclopentadienyl)chromium(II), commonly known as chromocene (CAS 1271-24-5), is an organometallic chromium sandwich compound with the formula Cr(C5H5)2 and a molar mass of 182.18 g/mol. Supplied as a solid, this air- and moisture-sensitive metallocene serves as a homogeneous catalyst in synthetic chemistry and as a volatile chromium precursor for vapour-deposition processes. Tech Serve Solutions supplies and exports it as a research-grade reagent for laboratory and materials-science use.
- IUPAC
- Chromocene,Di(cyclopentadienyl)chromium(II)
- Synonyms
- ChromoceneDi(cyclopentadienyl)chromium(II)Bis(cyclopentadienyl)chromium(II)Bis(eta5-cyclopentadienyl)chromiumChromium dicyclopentadienylDicyclopentadienylchromium
Stereoselective cross-coupling catalysis
Chromocene is used as a catalyst for stereoselective pinacol-type cross-coupling reactions. It enables the controlled carbon-carbon bond formation that underpins these reductive couplings in organic synthesis.
Nozaki-Hiyama-Kishi reactions
It acts as a catalyst in Nozaki-Hiyama-Kishi reactions, mediating the addition of organic halides to aldehydes. This chromium-based coupling is valued for building complex molecular frameworks under mild conditions.
Polymerisation catalysis
The compound is applied as a catalyst in thermal homo-polymerisation and co-polymerisation reactions. Its organochromium character makes it a useful single-component initiator in polymer chemistry.
CVD and ALD precursor
As a volatile chromium metallocene, chromocene is employed as a precursor in chemical vapour deposition (CVD) and atomic layer deposition (ALD). It supports the controlled formation of chromium-containing thin films in micro- and nanoelectronics and materials science.
Inorganic and organometallic research
Chromocene is a reference organometallic reagent for studies in catalysis and inorganic chemistry. It is widely used to explore the reactivity and bonding of chromium sandwich complexes.
| Molecular weight | 182.18 |
|---|---|
| Linear formula | Cr(C5H5)2 |
| Assay | 95% |
| Form | solid |
| Application | Catalyst for:• Stereoselective pinacol-type cross-coupling reactions1• Thermal homo-polymerization and co-polymerization reactions2• Nozaki-Hiyama-Kishi reactions (additions of organic halides to aldehydes)3 |
| Melting point | 168-170 °C(lit.) |
Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H315Causes skin irritation
- H319Causes serious eye irritation
- H332Harmful if inhaled
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22-36/37/38 |
| Safety statements (S) | 26-37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Bis(cyclopentadienyl)chromium(II) used for?
+
Bis(cyclopentadienyl)chromium(II), or chromocene, is used as a homogeneous catalyst for stereoselective pinacol-type cross-coupling, Nozaki-Hiyama-Kishi additions of organic halides to aldehydes, and thermal homo- and co-polymerisation reactions. As a volatile chromium metallocene it also serves as a precursor for CVD and ALD thin-film deposition in materials science and electronics.
What is the CAS number and molecular formula of Bis(cyclopentadienyl)chromium(II)?
+
Its CAS number is 1271-24-5 and its molecular formula is Cr(C5H5)2, giving a molecular weight of 182.18 g/mol. The EC number is 215-036-4 and the MDL number is MFCD00013750. It is also known as chromocene.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies Bis(cyclopentadienyl)chromium(II) as a research-grade reagent with a typical assay of 95%, in solid form (melting point 168-170 degrees C). We do not represent this material as USP, BP or EP pharmacopoeia grade. Specifications can be confirmed against the batch certificate of analysis on request.
What are the safety and handling requirements for chromocene?
+
Chromocene carries the GHS07 pictogram with the signal word Warning. Hazard statements are H302, H312, H315, H319, H332 and H335: it is harmful if swallowed, in contact with skin or if inhaled, and causes skin and eye irritation and may cause respiratory irritation. It is air- and moisture-sensitive and should be handled under an inert atmosphere. Use a type N95 dust mask, eye protection and gloves (P261, P280, P305+P351+P338). It is rated WGK 3, indicating a severe hazard to water.
How is Bis(cyclopentadienyl)chromium(II) packed, shipped and exported?
+
Because the compound is air- and moisture-sensitive, it is packed in sealed, inert containers suitable for its physical form and quantity, with appropriate hazard labelling and documentation. Tech Serve Solutions arranges compliant packaging and export shipment with full safety data sheets. Please confirm pack sizes and destination-country requirements when you enquire.
How do I request a sample or quote?
+
Contact Tech Serve Solutions with your required quantity, purity and delivery destination, and we will respond with availability, lead time and a formal quotation. Samples may be available for qualification, subject to handling and shipping requirements for this air-sensitive material.
▶ Related products
Benzeneruthenium(II) chloride dimer
Ru2(C6H6)2Cl4
Catalysis & Inorganic
Benzoylferrocene
C17H14FeO
Catalysis & Inorganic
Benzyldiphenylphosphine
C6H5CH2P(C6H5)2
Catalysis & Inorganic
Beryllium
Be
Catalysis & Inorganic
Beryllium oxide
BeO
Catalysis & Inorganic![Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer — chemical structure, CAS 12257-42-0; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F12257-42-0.png&w=3840&q=75)
Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer
Catalysis & Inorganic
![Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo — chemical structure, CAS 1228149-03-8; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1228149-03-8.png&w=3840&q=75)
Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo
1-d:1′
Catalysis & Inorganic![Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride (C16H20ClN3Ni) — chemical structure, CAS 1033772-47-2; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1033772-47-2.png&w=3840&q=75)
Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride
C16H20ClN3Ni
Catalysis & Inorganic▶ Explore more
3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis
3-Methyl-1,5-pentanediol
Chemical Synthesis
3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis