But-3-enylbenzene
C10H12
but-3-enylbenzene
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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 hydrocarbon compound with an unsaturated aliphatic side chain and molecular formula C10H12. This chemical substance represents a member of the alkylbenzene family, characterized by a benzene ring substituted with a four-carbon chain containing a terminal double bond. With a molecular weight of 132.2 g/mol, but-3-enylbenzene exhibits properties typical of both aromatic and alkene functionalities, making it a versatile intermediate in organic synthesis. The compound's structure combines the stability of the benzene ring with the reactivity of the terminal alkene group, providing multiple sites for chemical modification and derivatization. From a safety perspective, but-3-enylbenzene is classified under GHS with warning pictograms GHS07 and GHS09, indicating skin irritation potential (Skin Irrit. 2) and chronic aquatic toxicity (Aquatic Chronic 2). The substance requires ADR Class 3 handling protocols due to its flammable nature. Proper personal protective equipment and environmental precautions are essential during handling and storage operations. Industrial applications of but-3-enylbenzene primarily focus on its role as a chemical intermediate in the synthesis of specialty chemicals, polymers, and pharmaceutical compounds. The reactive double bond enables polymerization reactions, while the aromatic ring provides structural stability in final products. Additionally, it serves as a building block for the production of surfactants and industrial solvents. Unlike structurally different compounds such as 3,3-bis(methoxymethyl)-2,6-dimethylheptane, but-3-enylbenzene's aromatic character makes it particularly suitable for applications requiring aromatic functionality. OYSI maintains reliable supply chains for but-3-enylbenzene, ensuring consistent availability for European industrial customers requiring this specialized aromatic intermediate.
Safety & Classification
Skin Irrit. 2; Aquatic Chronic 2
GHS Pictograms
HHazard Statements (H-Statements)
Describe the nature and severity of the hazard
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
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 Number | 3295 |
| ADR Class | 3 |
| Packing Group | III |
| Tunnel Code | D/E |
| Proper Shipping Name | 4-Phenylbut-1-en |
| Marine Pollutant | No |
Frequently Asked Questions
What is but-3-enylbenzene?
But-3-enylbenzene is an organic aromatic compound with the molecular formula C10H12 and CAS number 768-56-9. This chemical consists of a benzene ring connected to a four-carbon chain containing a double bond at the third position. With a molecular weight of 132.2 g/mol, it belongs to the class of alkylated aromatics and is classified as a skin irritant and aquatic chronic hazard under GHS regulations.
What are the physicochemical properties of but-3-enylbenzene?
But-3-enylbenzene is a liquid organic compound at room temperature with characteristic aromatic odor typical of benzene derivatives. As an aromatic hydrocarbon with molecular formula C10H12, it exhibits limited water solubility but good solubility in organic solvents. The compound has a molecular weight of 132.2 g/mol and contains both aromatic and aliphatic unsaturation, making it reactive under certain conditions.
What is but-3-enylbenzene used for?
But-3-enylbenzene serves primarily as an intermediate in organic synthesis and chemical manufacturing processes. It is commonly used in the production of specialty chemicals, pharmaceutical intermediates, and fine chemicals where its unique structural features are valuable. The compound may also find applications in polymer chemistry and materials science due to its reactive double bond and aromatic ring system.
How to handle but-3-enylbenzene safely?
But-3-enylbenzene requires careful handling due to its skin irritant properties (Skin Irrit. 2 classification). Personnel must wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing to prevent skin contact. Work should be conducted in well-ventilated areas or under fume hoods. The compound carries a Warning signal word and requires standard precautions for handling flammable liquids (ADR Class 3).
How to store but-3-enylbenzene correctly?
But-3-enylbenzene should be stored in a cool, dry, well-ventilated area away from heat sources, sparks, and open flames due to its flammable nature (ADR Class 3, Group III). Containers must be kept tightly closed and made of compatible materials. Storage areas should be equipped with appropriate fire suppression systems and spill containment measures. Keep away from incompatible materials and ensure proper labeling with GHS pictograms GHS07 and GHS09.
What to do in case of contact with but-3-enylbenzene?
In case of skin contact with but-3-enylbenzene, immediately remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes due to its skin irritant properties. For eye contact, rinse immediately with clean water for 15 minutes and seek medical attention. If inhaled, move the person to fresh air. In case of ingestion, do not induce vomiting and seek immediate medical attention.
How to dispose of but-3-enylbenzene appropriately?
But-3-enylbenzene waste must be disposed of according to local, national, and international environmental regulations due to its Aquatic Chronic 2 classification. The compound should never be discharged into drains, soil, or water bodies. Disposal must be carried out by licensed waste management companies capable of handling flammable organic solvents. Container disposal should follow regulations for hazardous waste packaging materials.
How to transport but-3-enylbenzene?
But-3-enylbenzene is classified as ADR Class 3 (flammable liquids), Packing Group III for transportation purposes. Packages must comply with UN packaging requirements and display appropriate hazard labels including flammable liquid markings. Transport vehicles must be equipped with appropriate fire extinguishing equipment and emergency response information. Drivers require ADR training certification, and transport documentation must accompany shipments according to dangerous goods regulations.
Is but-3-enylbenzene subject to specific regulations?
But-3-enylbenzene is subject to standard REACH registration requirements in the European Union and must comply with CLP regulation for classification and labeling as Skin Irrit. 2 and Aquatic Chronic 2. The compound is not currently listed as a Substance of Very High Concern (SVHC). Users must follow workplace exposure limits and environmental discharge restrictions. Safety data sheets must be provided according to REACH Annex II requirements.
Where to buy but-3-enylbenzene in Europe?
But-3-enylbenzene is available through OYSI, a specialized European distributor of technical chemicals and industrial intermediates. OYSI provides high-quality but-3-enylbenzene with comprehensive documentation including safety data sheets, certificates of analysis, and regulatory compliance information. As an established chemical distributor, OYSI ensures proper packaging, labeling, and transportation according to ADR requirements throughout Europe, supporting both research institutions and industrial customers.
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Data Sources
Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.