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8.20270 EMD Millipore

Butyl chloroformate

Butyl chloroformate for synthesis. CAS No. 592-34-7, EC Number 209-750-5., for synthesis

Synonym: Chloroformic acid butyl ester, Butyl chlorocarboxylate

  • CAS Number 592-34-7

  • Linear Formula C₅H₉ClO₂

  • Molecular Weight 136.57 g/mol

  •  EC Number 209-750-5



Related Categories Biochemicals and Reagents More...
bp   138.0 - 144.5 °C (1013 hPa)
vapor pressure   7.18 hPa (20 °C)
density   1.06 g/cm3 (20 °C)
flash point   39 °C
autoignition temp.   285 °C DIN 51794
mp   -70 °C
LD 50 oral   LD50 Rat 1325 mg/kg
storage temp.   Store at +15°C to +25°C.
specifications   Assay (GC, area%): ≥ 95.0 % (a/a)
  Density (d 20 °C/ 4 °C): 1.055 - 1.057
  Identity (IR): passes test

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Safety Information

HS Code 
2915 90 70
Hazard Statement(s) 
H226: Flammable liquid and vapour.
H331: Toxic if inhaled.
H314: Causes severe skin burns and eye damage.
Precautionary Statement(s) 
P210: Keep away from heat/sparks/open flames/hot surfaces. No smoking.
P280: Wear protective gloves/ protective clothing/ eye protection/ face protection.
P304 + P340: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing.
P301 + P330 + P331: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P308 + P310: IF exposed or concerned: immediately call a POISON CENTER or doctor/ physician.
Storage class 
3 Flammable liquids
WGK 1 slightly water endangering
Organic acid halides, anhydrides and isocyanates can be added dropwise to an excess of methanol (Cat. No. 822283) to convert them into the corresponding methyl esters or methyl carbamates. If necessary, neutralize with sodium hydroxide solution (Cat. No. 105587). Fill into container A.
Hazard Pictogram(s) 
GHS02  GHS02
Hazard Pictogram(s) 
GHS05  GHS05
Hazard Pictogram(s) 
GHS06  GHS06
Hazard Symbols 
Toxic  Toxic
Declaration (railroad and road) ADR, RID 
UN 2743 , 6.1 (3, 8), II
Declaration (transport by air) IATA-DGR 
UN 2743 , 6.1 (3, 8),
Declaration (transport by sea) IMDG-Code 
UN 2743 , 6.1 (8, 3), II, Segregation Group: 1 (Acids)
Categories of danger 
flammable, toxic, corrosive
R Phrase 
R 10-23-34
Flammable.Toxic by inhalation.Causes burns.
S Phrase 
S 26-36-45
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear suitable protective clothing.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).


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