8.01537 EMD Millipore


2-Butyne-1,4-diol (not stabilised) for synthesis. CAS 110-65-6, pH 4 - 7.5 (100 g/l, H₂O, 23 °C)., (not stabilised) for synthesis

Synonym: 1,4-Dimethoxyacetylene

  • CAS Number 110-65-6

  • Linear Formula C₄H₆O₂

  • Molecular Weight 86.09 g/mol

  •  EC Number 203-788-6



Related Categories Biochemicals and Reagents More...
bp   125 - 127 °C (3 hPa)
vapor pressure   <1 Pa (20 °C)
solubility   3740 g/l
density   1.11 g/cm3 (20 °C)
flash point   152 °C
autoignition temp.   410 °C
mp   54 - 57 °C
pH   4 - 7.5 (100 g/l, H₂O, 23 °C)
bulk density   500 kg/m3
LD 50 oral   LD50 Rat 100 mg/kg
shipped in   ambient
storage temp.   Store below +30°C.
specifications   Assay (GC, area%): ≥ 99.0 % (a/a)
  Melting range (lower value): ≥ 54 °C
  Melting range (upper value): ≤ 57 °C
  Identity (IR): passes test

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Safety Information

HS Code 
2905 39 95
Hazard Statement(s) 
H301 + H311 + H331: Toxic if swallowed, in contact with skin or if inhaled.
H314: Causes severe skin burns and eye damage.
H317: May cause an allergic skin reaction.
H373: May cause damage to organs through prolonged or repeated exposure.
Precautionary Statement(s) 
P280: Wear protective gloves/ protective clothing/ eye protection/ face protection.
P301 + P330 + P331: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P302 + P352: IF ON SKIN: Wash with plenty of soap and water.
P304 + P340: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing.
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 
6.1C Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
WGK 2 water endangering
Carcinogenic compounds and flammable compounds labelled "Highly toxic" or "Toxic": container F. Alkyl sulfates are carcinogenic; Take particular care to avoid inhalation and skin contact. To neutralize alkyl sulfates, add dropwise (from a dropping funnel) to concentrated ice-cool Ammonia solution (Cat.No. 105426) with vigorous stirring. Before placing in container D, check the pH with pH Universal indicator strips (Cat.No. 109535).
Hazard Pictogram(s) 
GHS05  GHS05
Hazard Pictogram(s) 
GHS06  GHS06
Hazard Pictogram(s) 
GHS08  GHS08
Hazard Symbols 
Corrosive  Corrosive
Hazard Symbols 
Toxic  Toxic
Declaration (railroad and road) ADR, RID 
UN 2716 , 6.1, III
Declaration (transport by air) IATA-DGR 
UN 2716 , 6.1, III
Declaration (transport by sea) IMDG-Code 
UN 2716 , 6.1, III
Categories of danger 
toxic, corrosive, sensitizing
R Phrase 
R 21-23/25-34-43-48/22
Harmful in contact with skin.Toxic by inhalation and if swallowed.Causes burns.May cause sensitisation by skin contact.Harmful: danger of serious damage to health by prolonged exposure if swallowed.
S Phrase 
S 25-26-36/37/39-45-46
Avoid contact with eyes.In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear suitable protective clothing, gloves and eye/face protection.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).If swallowed, seek medical advice immediately and show this container or label.
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