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Name	1,4-Dichloro-2-butyne	EINECS	212-474-8
CAS No.	821-10-3	Density	1.222 g/cm³
PSA	0.00000	LogP	1.46740
Solubility	N/A	Melting Point	-34.5ºC
Formula	C₄H₄Cl₂	Boiling Point	165.5 °C at 760 mmHg
Molecular Weight	122.982	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		Hazard Symbols	Xi,T
Synonyms	2-Butyne, 1,4-dichloro-;1,4-Dichlorobutyne;4-01-00-00973 (Beilstein Handbook Reference);1,4-Dichlorobut-2-yne;	Article Data	31

1,4-Dichloro-2-butyne Synthetic route

: 110-65-6
1,4-dihydroxybut-2-yne

: 821-10-3
1,4-Dichloro-2-butyne

Conditions

Conditions	Yield
With pyridine; thionyl chloride	84%
With thionyl chloride In pyridine	82%
With pyridine; thionyl chloride at 0 - 20℃; for 2h;	56%

: 16669-40-2
but-2-yne-1,4-bisoxycarbonylchloride

: 821-10-3
1,4-Dichloro-2-butyne

Conditions

Conditions	Yield
With N,N-dimethyl-formamide In 1,2-dichloro-ethane at 80℃;	76%

: 110-65-6
1,4-dihydroxybut-2-yne

A: 13280-07-4
4-chlorobut-2-yn-1-ol

B: 821-10-3
1,4-Dichloro-2-butyne

Conditions

Conditions	Yield
With thionyl chloride; triethylamine In dichloromethane at 10 - 20℃;	A 54% B 18%
With pyridine; thionyl chloride In benzene at 10 - 20℃; for 6h;	A 49% B 24%
With pyridine; thionyl chloride In benzene at 0 - 20℃;	A 40% B 17%
With pyridine; thionyl chloride In benzene at 0 - 20℃;	A 35% B n/a
With pyridine; thionyl chloride In benzene 1) 10 - 20 deg C, 7 h, 2) overnight;	A 26% B 30%

: 110-86-1
pyridine

: 110-65-6
1,4-dihydroxybut-2-yne

: 7719-09-7
thionyl chloride

: 821-10-3
1,4-Dichloro-2-butyne

Conditions

Conditions	Yield
at 10 - 20℃;

: 110-65-6
1,4-dihydroxybut-2-yne

: 10026-13-8, 874483-75-7
phosphorus pentachloride

: 71-43-2
benzene

: 821-10-3
1,4-Dichloro-2-butyne

: 110-65-6
1,4-dihydroxybut-2-yne

SOCl2 (excess): SOCl2 (excess)

: 821-10-3
1,4-Dichloro-2-butyne

Conditions

Conditions	Yield
at 80℃;

: 110-65-6
1,4-dihydroxybut-2-yne

: 7647-01-0
hydrogenchloride

: 64-19-7
acetic acid

A: 7166-52-1
(Z)-2,4-dichloro-but-2-en-1-ol

B: 16346-49-9
3,4-dichloro-but-2-en-1-ol

C: 821-10-3
1,4-Dichloro-2-butyne

Conditions

Conditions	Yield
at 100 - 110℃;

...Expand

: 617-86-7
triethylsilane

: 821-10-3
1,4-Dichloro-2-butyne

: 108930-44-5
1,4-dichloro 2-triethylsilylbut-2-ene

Conditions

Conditions	Yield
With dihydrogen hexachloroplatinate In tetrahydrofuran at 85℃; for 4h;	100%
With platinum(IV) oxide In toluene at 100℃; for 24h; diastereoselective reaction;	75%
dihydrogen hexachloroplatinate
With dihydrogen hexachloroplatinate at 170℃; for 1h;

: 5707-04-0
Phenylselenyl chloride

: 821-10-3
1,4-Dichloro-2-butyne

: 85972-08-3
(E)-2-(Phenylseleno)-1,3,4-trichlorobut-2-ene

Conditions

Conditions	Yield
In acetonitrile at 25℃; for 20h;	100%

: 821-10-3
1,4-Dichloro-2-butyne

: 1,2,3,4,5-pentakis(chloromethyl)-5-(1'-chlorovinyl)cyclopentadiene

Conditions

Conditions	Yield
With copper dichloride; palladium dichloride In butan-1-ol; benzene at 25℃; for 24h;	100%
With copper dichloride; palladium dichloride In methanol; carbon dioxide at 40℃; under 120012 Torr; for 8h;	98%

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

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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