Product Name: 2-Methyl-1-buten-3-yne (CAS NO.78-80-8)

Molecular Formula: C₅H₆
Molecular Weight: 66.1g/mol
Mol File: 78-80-8.mol
Einecs: 201-144-9
Appearance: Clear colorless to light yellow liquid
Melting Point: -113 °C
Boiling point: 31.7 °C at 760 mmHg
Storage Temperature: 2-8°C
Density: 0.695 g/mL at 25 °C(lit.)
Refractive index: n20/D 1.416(lit.)
Surface Tension: 22.4 dyne/cm
Enthalpy of Vaporization: 26.56 kJ/mol
Vapour Pressure: 598 mmHg at 25°C
XLogP3-AA: 1.9
H-Bond Donor: 0
H-Bond Acceptor: 0

Poison by ingestion. Mildly toxic by inhalation. A skin irritant. A very dangerous fire hazard when exposed to heat or flame. When heated to decomposition it emits acrid smoke and irritating fumes. See also ACETYLENE COMPOUNDS and ALKYNES.
Safety Information of 2-Methyl-1-buten-3-yne (CAS NO.78-80-8):
Hazard Codes: F+,Xn,F,Xi
Risk Statements: 12-20/22-36/37/38-65 
12:  Extremely Flammable 
20:  Harmful by inhalation 
22:  Harmful if swallowed 
36:  Irritating to the eyes 
37:  Irritating to the respiratory system 
38:  Irritating to the skin 
65:  Harmful: May cause lung damage if swallowed 
Safety Statements: 16-26-36/37-62
16:  Keep away from sources of ignition - No smoking 
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36:  Wear suitable protective clothing  
37:  Wear suitable gloves 
62:  If swallowed, do not induce vomiting: seek medical advice immediately and show this container or label 

 2-Methyl-1-buten-3-yne ,its CAS NO. is 78-80-8,the synonyms is 1-Butene-3-yne, 2-methyl- ; 2-Methyl-1-butenyne ; 2-Methylbutenyne ; 3-Methyl-3-buten-1-yne ; CH₂=C(CH₃)CequivCH ; Valylene ;  Isopropenylacetylene .