2-Butyne
- CAS No.
- 503-17-3
- Chemical Name:
- 2-Butyne
- Synonyms
- But-2-yne;Butyne;DIMETHYLACETYLENE;2-BUTYNE;CROTONYLENE;2-Butyne>2-BUTYNE 98%;2-Butyne,98%;CH3CequivCCH3;2-Butyne（delete）
- CBNumber:
- CB7853683
- Molecular Formula:
- C4H6
Lewis structure
- Molecular Weight:
- 54.09
- MDL Number:
- MFCD00009275
- MOL File:
- 503-17-3.mol
- MSDS File:
- SDS
| Melting point | -32 °C |
|---|---|
| Boiling point | 27 °C(lit.) |
| Density | 0.691 g/mL at 25 °C(lit.) |
| vapor pressure | 11.47 psi ( 20 °C) |
| refractive index |
n |
| Flash point | -25 °C |
| storage temp. | 2-8°C |
| form | Liquid |
| Specific Gravity | 0.691 |
| color | Clear colorless to light yellow |
| Water Solubility | Not miscible in water. |
| Thermal Conductivity | 0.12 W/(m·K) at 25 ℃ |
| BRN | 1361340 |
| Henry's Law Constant | 4.6×10-4 mol/(m3Pa) at 25℃, Yaws (2003) |
| InChI | InChI=1S/C4H6/c1-3-4-2/h1-2H3 |
| InChIKey | XNMQEEKYCVKGBD-UHFFFAOYSA-N |
| SMILES | CC#CC |
| CAS DataBase Reference | 503-17-3(CAS DataBase Reference) |
| FDA UNII | LKE6D3018E |
| EPA Substance Registry System | 2-Butyne (503-17-3) |
| UNSPSC Code | 12352100 |
| NACRES | NA.22 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |   GHS02,GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H315-H319-H224 | |||||||||
| Precautionary statements | P501-P240-P210-P233-P243-P241-P242-P264-P280-P370+P378-P337+P313-P305+P351+P338-P362+P364-P303+P361+P353-P332+P313-P403+P235 | |||||||||
| target organs | Respiratory system | |||||||||
| PPE | Eyeshields, Faceshields, Gloves | |||||||||
| Hazard Codes | F+,Xi | |||||||||
| Risk Statements | 12-36/37/38 | |||||||||
| Safety Statements | 16-26-36 | |||||||||
| RIDADR | UN 1144 | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | GQ7210000 | |||||||||
| TSCA | TSCA listed | |||||||||
| HazardClass | 3 | |||||||||
| PackingGroup | I | |||||||||
| HS Code | 29012990 | |||||||||
| Storage Class | 3 - Flammable liquids | |||||||||
| Hazard Classifications | Eye Irrit. 2 Flam. Liq. 1 Skin Irrit. 2 STOT SE 3 |
|||||||||
| Limited Quantities | 0.5 L (0.1 gallon) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (300g or 300ml) | |||||||||
| NFPA 704 |
|
2-Butyne price More Price(23)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 254339 | 2-Butyne 99% | 503-17-3 | 5g | $70.1 | 2026-04-30 | Buy |
| Sigma-Aldrich | 254339 | 2-Butyne 99% | 503-17-3 | 25g | $237 | 2026-04-30 | Buy |
| TCI Chemical | B0951 | 2-Butyne >97.0%(GC) | 503-17-3 | 5mL | $52 | 2026-04-30 | Buy |
| Usbiological | 263607 | 2-Butyne Asreported | 503-17-3 | 50g | $955 | 2026-06-03 | Buy |
| Usbiological | 263607 | 2-Butyne Asreported | 503-17-3 | 100g | $1451 | 2026-06-03 | Buy |
2-Butyne Chemical Properties, Uses, Production
Chemical Properties
clear colorless to light yellow liquid
Uses
2-Butyne is used to synthesize alkylated hydroquinones in the total synthesis of Vitamin E. It is also used as pharmaceutical intermediates.
General Description
A clear colorless liquid with a petroleum-like odor. Flash point below -4°F. Boiling point 81°F. Less dense than water and insoluble in water. Vapors heavier than air.
Air & Water Reactions
Highly flammable. Insoluble in water.
Reactivity Profile
2-Butyne may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release hydrogen gas. In the presence of various catalysts (such as acids) or initiators, may undergo exothermic addition polymerization reactions.
Hazard
Flammable, dangerous fire risk. Moderate explosion hazard.
Health Hazard
Inhalation or contact with material may irritate or burn skin and eyes. Fire may produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.
Safety Profile
A simple asphyxiant. Very dangerous fire hazard when exposed to heat or flame; can react with oxidzing materials. Moderately explosive in the form of vapor when exposed to heat or flame. To fight fire, use foam, CO2, dry chemicals. See also ACETYLENE COMPOUNDS and ARGON (for a description of simple asphyxiants).
Purification Methods
Stand it over sodium for 24hours, then fractionally distil it under reduced pressure into a cooled receiver. [Beilstein 1 IV 971.]
2-Butyne Preparation Products And Raw materials
Raw materials
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Preparation Products
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Wuhan eastop Technology Co., ltd.6 | 18086015167 17702779303 | service@isotopechina.com | China | 268 | 58 |
| Shanghai wechem chemical co., ltd | 18824865657 | 2684615189@qq.com | China | 428 | 58 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| TCI (Shanghai) Development Co., Ltd. | 021-67121386 | Sales-CN@TCIchemicals.com | China | 24512 | 81 |
| Energy Chemical | 400-0056266 | sales8178@energy-chemical.com | China | 44850 | 61 |
| Thermo Fisher Scientific | 800-810-5118 | cnchemical@thermofisher.com | China | 17752 | 75 |
| TOKYO CHEMICAL INDUSTRY CO., LTD. | 03-36680489 | Sales-JP@TCIchemicals.com | Japan | 28364 | 80 |
| TCI Europe | 320-37350700 | sales@tcieurope.eu | Europe | 23654 | 75 |
| TCI AMERICA | 800-4238616 | sales@tciamerica.com | Americas | 23636 | 75 |
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