2-Butyne
[CAS# 503-17-3]

Identification

• Classification: Chemical reagent >> Organic reagent >> Alkyne
• Name: 2-Butyne
• Synonyms: 2-Butine; Dimethylacetylene
• Molecular Formula: C₄H₆
• Molecular Weight: 54.09
• CAS Registry Number: 503-17-3
• EC Number: 207-962-2

Properties

• Solubility: Slightly soluble (1.8 g/L) (25 °C), Calc.^*
• Density: 0.715 g/cm³ (0 °C)^**
• Melting point: 122-126 °C^***
• Boiling point: 80.8-81.1 °C^****
• Refractive index: 1.3975 (589.3 nm 16 °C)^*****
• Flash point: -48.5±11.2 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2016 ACD/Labs)

^** Heisig, G. B.

^*** Colton, Frank B.

^**** Kharasch, Norman

^***** Gredy, Blanche

Safety Data

• Hazard Symbols: F+;Xi
• Risk Statements: R12;R36/37/38
• Safety Statements: S16;S26;S36

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Flammable liquids	Flam. Liq.	1	H224
Eye irritation	Eye Irrit.	2	H319
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335

• Transport Information: UN 1144 - class 3 - PG 1 - Crotonylene