2-Butyne
- Product Name
- 2-Butyne
- CAS No.
- 503-17-3
- Chemical Name
- 2-Butyne
- Synonyms
- Butyne;2-BUTYNE;But-2-yne;CROTONYLENE;2-Butyne>2-BUTYNE 98%;2-Butyne,98%;CH3CequivCCH3;2-Butyne（delete）;CROTONYLENE(DOT)
- CBNumber
- CB7853683
- Molecular Formula
- C4H6
- Formula Weight
- 54.09
- MOL File
- 503-17-3.mol
2-Butyne Property
- 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
- n20/D 1.393(lit.)
- 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.
- BRN
- 1361340
- 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)
- EPA Substance Registry System
- 2-Butyne (503-17-3)
Safety
- Hazard Codes
- F+,Xi
- Risk Statements
- 12-36/37/38
- Safety Statements
- 16-26-36
- RIDADR
- UN 1144 3/PG 1
- WGK Germany
- 3
- RTECS
- GQ7210000
- TSCA
- Yes
- HazardClass
- 3
- PackingGroup
- I
- HS Code
- 29012990
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Hazard statements
-
H224Extremely flammable liquid and vapour
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
- Precautionary statements
-
P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P302+P352IF ON SKIN: wash with plenty of soap and water.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P403+P233Store in a well-ventilated place. Keep container tightly closed.
N-Bromosuccinimide Price
- Product number
- 254339
- Product name
- 2-Butyne
- Purity
- 99%
- Packaging
- 5g
- Price
- $62.51
- Updated
- 2025/07/31
- Product number
- 254339
- Product name
- 2-Butyne
- Purity
- 99%
- Packaging
- 25g
- Price
- $223
- Updated
- 2025/07/31
- Product number
- B0951
- Product name
- 2-Butyne
- Purity
- >97.0%(GC)
- Packaging
- 5mL
- Price
- $61
- Updated
- 2025/07/31
- Product number
- 80281
- Product name
- 2-Butyne, 98%
- Packaging
- 25g
- Price
- $187.81
- Updated
- 2021/12/16
- Product number
- 117205
- Product name
- 2-Butyne
- Purity
- 97%
- Packaging
- 5g
- Price
- $35
- Updated
- 2021/12/16
2-Butyne Chemical Properties,Usage,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
Preparation Products
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