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EINECS 212-474-8
CAS No. 821-10-3 Density 1.222 g/cm3
PSA 0.00000 LogP 1.46740
Solubility Melting Point -34.5ºC
Formula C4H4Cl2 Boiling Point 165.5 °C at 760 mmHg
Molecular Weight 122.98 Flash Point 70.7 °C
Transport Information UN 2810 Appearance Clear brown liquid.
Safety 26-36-45-38-36/37/39-28A Risk Codes 36/37/38-40-23/24/25
Molecular Structure Molecular Structure of 821-10-3 (1,4-Dichloro-2-butyne) Hazard Symbols IrritantXi,ToxicT

2-Butyne, 1,4-dichloro-;1,4-Dichlorobutyne;4-01-00-00973 (Beilstein Handbook Reference);1,4-Dichlorobut-2-yne;


1,4-Dichloro-2-butyne Chemical Properties

Molecular Formula:C4H4Cl2
Molar mass:122.98056g/mol
Structure of 1,4-Dichloro-2-butyne(821-10-3):
Synonyms of 1,4-Dichloro-2-butyne(821-10-3):1,4-DICHLORO-2-BUTYNE;1,4-Dichlorobutyne;
2-Butyne, 1,4-dichloro-;1,4-Dichlorobut-2-yne
Density:1.222 g/cm3                
Flash Point:70.7 °C     
Boiling Point:165.5 °C at 760 mmHg         
Index of Refraction:1.474 
Vapour Pressure:2.46 mmHg at 25°C  
Melting point:165-168°C 
storage temp:2-8°C
Sensitive:Light Sensitive

1,4-Dichloro-2-butyne Toxicity Data With Reference


ivn-mus LD50:56 mg/kg

   CSLNX*    U.S. Army Armament Research & Development Command, Chemical Systems Laboratory, NIOSH Exchange Chemicals. (Aberdeen Proving Ground, MD 21010) NX#02969 .
Carcinogenicity:1,4-Dichloro-2-butyne(821-10-3)- Not listed as a carcinogen by  NTP, IARC,ACGIH, or CA Prop 65. 
Other: The toxicological properties have not been fully investigated.See actual entry in RTECS for complete information.

1,4-Dichloro-2-butyne Consensus Reports

Reported in EPA TSCA Inventory.

1,4-Dichloro-2-butyne Safety Profile

Poison by intravenous route. When heated to decomposition it emits toxic fumes of Cl. Probably a dangerous fire and explosion hazard.See also ACETYLENE COMPOUNDS and ALKYNES and CHLORINATED HYDROCARBONS, ALIPHATIC.
Hazard Codes:Xi,T
Risk Statements:
23:  Toxic by inhalation
24:  Toxic in contact with skin
25:  Toxic if swallowed
36:  Irritating to the eyes
37:  Irritating to the respiratory system
38:  Irritating to the skin
39:  Danger of very serious irreversible effects
40:  Limited evidence of a carcinogenic effect
Safety Statements:
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
28:  After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) 
36:  Wear suitable protective clothing 
37:  Wear suitable gloves
38:  In case of insufficient ventilation, wear suitable respiratory equipment
39:  Wear eye/face protection
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)

1,4-Dichloro-2-butyne Specification

Stability and Reactivity of 1,4-Dichloro-2-butyne(821-10-3):
Conditions to Avoid:Incompatible materials, light. 
Incompatibilities with Other Materials:strong bases,strong oxidizing agents.
Hazardous Decomposition Products: carbon dioxide,hydrogen bromide,Carbon monoxide.

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