2-Methyl-3-butyn-2-ol

  • 1,1-Dimethylpropargyl alcohol
  • Methyl butynol
Formula
C5H8O
Structure
Description
Colorless to straw yellow liquid.

Registry Numbers and Inventories.
CAS
115-19-5
EC (EINECS/ELINCS)
204-070-5
EC Class
highly flammable, harmful, irritant
R 10 22 41
S 16 23 26 36
RTECS
ES0810000
RTECS class
Drug
UN (DOT)
1987
Merck
12,6113
Beilstein/Gmelin
635746
Beilstein Reference
4-01-00-02229
Swiss Giftliste 1
G-8029
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C5H8O
Formula mass
84.12
Melting point, °C
3
Boiling point, °C
104
Vapor pressure, mmHg
17 (25 C)
Vapor density (air=1)
2.9
Density
0.8637 g/cm3 (16 C)
Solubility in water
Miscible
Viscosity
3.8 cP 20.00 C
Surface tension
23.8 g/s2 (25 C)
Refractive index
1.4154 (15.8 C)
pKa/pKb
13.34
Partition coefficient, pKow
0.32
Heat of vaporization
40.0 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Use a spark-proof tool. Provide ventilation. A vapor suppressing foam may be used to reduce vapors.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
20
Autoignition, °C
350
Upper exp. limit, %
16
Lower exp. limit, %
1.8
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. In case of fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Water may be ineffective. Use agent most appropriate to extinguish fire. Do NOT use straight streams of water.
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Irritating and toxic gases, such as carbon dioxide and carbon monoxide, may be produced in fire.
Health
1
 
Flammability
3
 
 
Reactivity
1
 

Health.
Poison_Class
4
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed.
   Inhalation
May cause respiratory tract irritation. Vapors may cause dizziness or suffocation.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1987
Response guide
Hazard class
3
Packing Group
I; II; III
 
USCG CHRIS Code
MBY
 
20 Alcohols, Glycols
HS Code
2905 29 90
 
IMO Chemical Code
17
IMO Pollution Category
III D
IMO Hazard code
S