Bis(butylcyclopentadienyl)tungsten(IV) dichloride
Bis(butylcyclopentadienyl)tungsten(IV) dichloride (CAS 87695-18-9; C18H26Cl2W; molar mass 497.15 g/mol) is an organotungsten metallocene complex supplied by Tech Serve Solutions as a research-grade solid of 97% assay. The butyl-substituted cyclopentadienyl ligands confer useful solubility and volatility, making it a precursor in catalysis, organometallic synthesis and the deposition of tungsten-containing thin films. It melts with decomposition at 107-109 degrees Celsius.
- Synonyms
- Bis(butylcyclopentadienyl)tungsten(IV) dichlorideBis(n-butylcyclopentadienyl)tungsten dichlorideDichlorobis(butylcyclopentadienyl)tungsten(IV)Bis(butylcyclopentadienyl)dichlorotungstenCAS 87695-18-9

Tungsten thin-film precursor
The complex serves as a volatile, soluble organometallic source of tungsten for vapour-phase deposition processes used to produce tungsten and tungsten-containing films. Its butylcyclopentadienyl ligands aid handling and delivery in such systems.
Organometallic synthesis
It is used as a defined tungsten(IV) building block for preparing further organotungsten complexes and for studies in coordination and organometallic chemistry.
Catalysis research
As a well-characterised metallocene-type tungsten complex, it is employed in catalysis and inorganic-chemistry investigations where a tungsten centre with cyclopentadienyl ligands is required.
Materials and laboratory reagent
The compound functions as a research reagent in materials chemistry and chemical synthesis programmes that call for a discrete, high-assay tungsten precursor.
| Molecular weight | 497.15 |
|---|---|
| Empirical formula | C18H26Cl2W |
| Assay | 97% |
| Melting point | 107-109 °C (dec.)(lit.) |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
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(butylcyclopentadienyl)tungsten(IV) dichloride used for?
+
It is used mainly as an organometallic tungsten precursor and reagent. Typical roles include the deposition of tungsten-containing thin films, the synthesis of other organotungsten complexes, and catalysis and inorganic-chemistry research that requires a defined tungsten(IV) metallocene.
What is the CAS number and molecular formula of Bis(butylcyclopentadienyl)tungsten(IV) dichloride?
+
Its CAS number is 87695-18-9 and its empirical formula is C18H26Cl2W (Hill notation), corresponding to a molecular weight of 497.15 g/mol. The MDL number is MFCD02093657.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies this material as a research/technical-grade solid with a typical assay of 97%. We do not represent it as USP, BP or EP pharmacopoeia grade. A certificate of analysis can be provided with each batch on request.
How should Bis(butylcyclopentadienyl)tungsten(IV) dichloride be handled safely?
+
Handle it only as a trained chemist using suitable personal protective equipment: eye shields, gloves and an N95 (US) or P1 (EN143) respirator filter where dust may be generated. It is classified WGK 3 (severely water-hazardous in Germany), so prevent release to drains, soil or watercourses and follow the supplied documentation and local regulations.
Is Bis(butylcyclopentadienyl)tungsten(IV) dichloride a controlled or scheduled substance?
+
The supplied data does not indicate any narcotic, precursor or drug-control scheduling for this compound. It is handled as a standard research chemical, subject to the usual chemical-safety and environmental controls such as its WGK 3 water-hazard classification.
How is Bis(butylcyclopentadienyl)tungsten(IV) dichloride packed, shipped and exported?
+
It is packed in tightly closed, appropriately labelled containers sized to the order, with batch documentation. Tech Serve Solutions handles export logistics and documentation worldwide; air-freight and other modes are arranged in line with the applicable transport regulations for the consignment.
How do I request a sample or quote?
+
Contact Tech Serve Solutions with your required quantity, packing and destination, and we will respond with availability, lead time and a quotation. Sample requests for evaluation can be accommodated subject to availability.
▶ 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