But-3-enylbenzene

C10H12

but-3-enylbenzene

CAS768-56-9
GHS07 Gefahrensymbol: Gesundheitsschädlich/Reizend – Ausrufezeichen
GHS09 Gefahrensymbol: Umweltgefährlich – Umwelt
Warning

Consulting for But-3-enylbenzene

Our experts support you with application, dosage, and compliance.

Request Consultation

Identification

CAS Number
768-56-9
EC Number
405-980-7
UN Number
3295
Index Number
601-051-00-7
PubChem CID
13033

Physical-chemical properties

Molecular Formula
C10H12
Molar Mass
132.20 g/mol
IUPAC Name
but-3-enylbenzene

Chemical Identifiers

InChI
InChI=1S/C10H12/c1-2-3-7-10-8-5-4-6-9-10/h2,4-6,8-9H,1,3,7H2
InChI Key
PBGVMIDTGGTBFS-UHFFFAOYSA-N

Overview

But-3-enylbenzene (CAS 768-56-9) is an aromatic alkene compound with a phenyl group attached to a four-carbon chain containing a terminal double bond. This organic compound, also known by its IUPAC designation but-3-enylbenzene, represents a significant intermediate in synthetic organic chemistry and industrial applications. With the molecular formula C10H12 and a molecular weight of 132.2 g/mol, this aromatic alkene combines the stability of a benzene ring with the reactivity of a terminal alkene functional group. The structure consists of a phenyl group connected to a butenyl chain, where the double bond is positioned at the terminal carbon, making it particularly valuable for polymerization reactions and further chemical modifications. From a safety perspective, but-3-enylbenzene is classified under the GHS system with Warning signal word and requires careful handling due to its skin irritation properties (Skin Irrit. 2) and potential environmental impact on aquatic systems (Aquatic Chronic 2). The compound falls under ADR transport class 3, indicating its flammable nature, and displays GHS07 and GHS09 pictograms reflecting its health and environmental hazard classifications. Industrial applications of but-3-enylbenzene primarily include its use as a monomer in polymer synthesis, particularly in the production of specialty plastics and resins. The compound also serves as an important building block in fine chemical synthesis and pharmaceutical intermediate manufacturing. Its reactive terminal alkene group makes it suitable for cross-linking applications and copolymerization processes, often in conjunction with other aromatic compounds. Similar to other specialized organic intermediates like 3,3-bis(methoxymethyl)-2,6-dimethylheptane used in synthetic applications, but-3-enylbenzene requires proper storage and handling protocols. OYSI maintains reliable supply chains for this technical chemical compound, ensuring consistent availability for European industrial customers.

Safety & Classification

Warning
Classification:

Skin Irrit. 2; Aquatic Chronic 2

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H315

Causes skin irritation.

H411

Toxic to aquatic life with long lasting effects.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Skin Contact

Irritant

Measures if substance contacts the skin

First Aid Actions

  • +P302IF ON SKIN:
  • +P352Wash with plenty of water.
  • +P361Take off immediately all contaminated clothing.
  • +P313Get medical advice/attention.

Related hazard statements:

General Measures

Emergency 112 | Poison Control: +49 30 19240 (DE), +33 1 45 42 59 59 (FR), +31 30 274 88 88 (NL)

First aid measures are based on CLP classification and associated P-statements. They do not replace the Safety Data Sheet (SDS). In case of emergency, always consult the full SDS and a physician.

Transport (ADR)

UN Number3295
ADR Class3
Packing GroupIII
Tunnel CodeD/E
Proper Shipping Name4-Phenylbut-1-en
Marine PollutantNo

Frequently Asked Questions

What is but-3-enylbenzene?

But-3-enylbenzene is an organic chemical compound with the molecular formula C10H12 and CAS number 768-56-9. This aromatic hydrocarbon consists of a benzene ring substituted with a but-3-enyl chain, making it an unsaturated compound with a molecular weight of 132.2 g/mol. It belongs to the class of alkylbenzenes and contains both aromatic and alkene functional groups, which influence its chemical reactivity and applications in organic synthesis.

What are the physicochemical properties of but-3-enylbenzene?

But-3-enylbenzene is a liquid organic compound at room temperature with a molecular formula C10H12 and molecular weight of 132.2 g/mol. As an aromatic hydrocarbon with an alkene chain, it is typically colorless to pale yellow and exhibits low water solubility due to its hydrophobic nature. The compound is soluble in organic solvents such as alcohols, ethers, and hydrocarbons, and possesses characteristic aromatic odor properties typical of substituted benzenes.

What is but-3-enylbenzene used for?

But-3-enylbenzene is primarily used as an intermediate in organic synthesis and chemical manufacturing processes. Its dual functionality as both an aromatic compound and an alkene makes it valuable for producing specialty chemicals, pharmaceuticals, and fine chemical intermediates. The compound can undergo various chemical transformations including polymerization, hydrogenation, and electrophilic aromatic substitution reactions, making it useful in research and development applications within the chemical industry.

How to handle but-3-enylbenzene safely?

But-3-enylbenzene requires careful handling due to its skin irritant properties (Skin Irrit. 2) and flammable nature. Appropriate personal protective equipment includes chemical-resistant gloves, safety goggles, and protective clothing to prevent skin contact. Work in well-ventilated areas or under fume hoods to avoid inhalation. Keep away from ignition sources, heat, and open flames. The GHS07 pictogram indicates health hazards, requiring adherence to standard laboratory safety protocols for handling irritant chemicals.

How to store but-3-enylbenzene correctly?

But-3-enylbenzene should be stored in a cool, dry, well-ventilated area away from heat sources and ignition points due to its flammable nature (ADR Class 3). Store in tightly sealed, compatible containers to prevent contamination and evaporation. Keep away from incompatible materials such as strong oxidizing agents and acids. Storage areas should comply with local fire safety regulations for flammable liquids, and containers should be properly labeled with appropriate hazard warnings and safety information.

What to do in case of contact with but-3-enylbenzene?

But-3-enylbenzene can cause skin irritation, so immediate action is required upon contact. For skin contact, remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. If eye contact occurs, rinse immediately with clean water for 15-20 minutes and seek medical attention. In case of inhalation, move to fresh air immediately. If ingestion occurs, do not induce vomiting and seek immediate medical attention while providing the safety data sheet to healthcare professionals.

How to dispose of but-3-enylbenzene appropriately?

But-3-enylbenzene waste must be disposed of according to local and national hazardous waste regulations due to its flammable and potentially harmful properties. The compound should not be released into the environment given its Aquatic Chronic 2 classification. Waste should be collected in appropriate containers and handed over to licensed waste disposal companies for incineration or other approved treatment methods. Empty containers should also be treated as hazardous waste and disposed of accordingly.

How to transport but-3-enylbenzene?

But-3-enylbenzene is classified under ADR Class 3 (flammable liquids), Packing Group III, indicating moderate danger during transport. Transportation must comply with ADR regulations for flammable liquids, requiring appropriate packaging, labeling, and documentation. Vehicles must carry proper fire extinguishing equipment and drivers need ADR certification. Packages must display the correct UN identification number, proper shipping name, and hazard labels including flammable liquid pictograms to ensure safe handling throughout the transport chain.

Is but-3-enylbenzene subject to specific regulations?

But-3-enylbenzene is subject to standard chemical regulations including REACH registration requirements for manufacture or import in the European Union above one tonne per year. The compound is classified under CLP regulation with specific hazard classifications (Skin Irrit. 2, Aquatic Chronic 2) requiring appropriate labeling and safety data sheets. It is not currently listed as a Substance of Very High Concern (SVHC). Users must comply with occupational health and safety regulations and environmental protection requirements in their respective jurisdictions.

Where to buy but-3-enylbenzene in Europe?

But-3-enylbenzene is available through specialized chemical distributors across Europe, including OYSI, a leading European distributor of technical chemicals. OYSI provides high-quality chemical products with proper documentation, safety data sheets, and regulatory compliance for professional and industrial customers. When purchasing, ensure the supplier provides appropriate certificates of analysis, safety documentation, and complies with REACH registration requirements. Contact chemical distributors directly for availability, specifications, and technical support for your specific application needs.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.