IUPAC Name: But-3-yn-2-one
Synonyms: Acetylacetylene ; Acetylethyne ; But-3-yn-2-one ; CH3COCequivCH ; Ketone, ethynyl methyl ; Methyl ethynyl ketone ; Ethynyl Methyl Ketone ; 1-Butyn-3-one
ProductCategories: ketone;Acetylenes;Functionalized Acetylenes;C3 to C6;Carbonyl Compounds;Ketones
Molecular Formula of 3-Butyn-2-one (CAS NO.1423-60-5 ) : C₄H₄O
Molecular Weight: 68.07 g/mol
Structure Descriptors :
  Smiles: C(C#C)(C)=O
Molecular Structure of 3-Butyn-2-one (CAS NO.1423-60-5) :

EINECS: 215-834-2
Index of Refraction: 1.403
Surface Tension: 29.1 dyne/cm
Density: 0.902 g/cm³
Flash Point: -1°C
Enthalpy of Vaporization: 32.54 kJ/mol
Boiling Point: 85 °C at 760 mmHg
Vapour Pressure: 70.6 mmHg at 25°C
Appearance: clear yellow to orange-brown liquid
Storage temp: 0-6°C
Solubility in water: Soluble
Stability of 3-Butyn-2-one (CAS NO.1423-60-5 ) : Stable at room temperature in closed containers under normal storage and handling conditions.

Hazard Codes: F,T+,T,Xi,E,Xn
Risk Statements: 28-36/37/38-11-15-10
R28:Very toxic if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R11:Highly flammable. 
R15:Contact with water liberates extremely flammable gases. 
R10:Flammable. 
Safety Statements: 45-36/37/39-28A-26-16-43-7/8
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S28:After contact with skin, wash immediately with plenty of soap-suds. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S16:Keep away from sources of ignition. 
S43:In case of fire use ... (there follows the type of fire-fighting equipment to be used.) 
S7:Keep container tightly closed. 
S8:Keep container dry. 
Transport Information of 3-Butyn-2-one (CAS NO.1423-60-5 ): UN 1992
RIDADR: UN 1992 3/PG 2
WGK Germany: 3
RTECS: ES0875000
F: 19
Hazard Note: Highly Flammable/Highly Toxic
HazardClass: 3
PackingGroup: II
 

Classification Code of 3-Butyn-2-one (CAS NO.1423-60-5) : Mutation data;Reproductive Effect;Skin / Eye Irritant 
Preparation Products: 2,6-Dimethyl-pyridine-3-carbaldehyde
3-Butyn-2-one (CAS NO.1423-60-5) should keep away from heat, sparks, and flame, also should keep away from sources of ignition. It should be stored in a tightly closed container, or stored in a cool, dry, well-ventilated area away from incompatible substances, Flammables-area, Poison room locked/refrigerator.