Dimethyl 2-butynedioate

  • Dimethyl ethynedicarboxylate
  • 1,2-Bis(methoxycarbonyl)ethyne
  • Bis(carbomethoxy)acetylene
  • Dimethyl 1,2-acetylenedicarboxylate
  • Acetylenedicarboxylic acid, dimethyl ester
  • 2-Butynedioic acid, dimethyl ester
Formula
C6H6O4
Structure
Description
Clear slightly yellow liquid.

Registry Numbers and Inventories.
CAS
762-42-5
EC (EINECS/ELINCS)
212-098-4
EC Class
corrosive
R 21/22 34 36
S 26 36/37/39 45
RTECS
ES0175000
RTECS class
Agricultural Chemical and Pesticide
UN (DOT)
2810
Beilstein/Gmelin
607063
Beilstein Reference
4-02-00-02291
Swiss Giftliste 1
G-7258
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C6H6O4
Formula mass
142.11
Melting point, °C
-18
Boiling point, °C
204
Vapor pressure, mmHg
0.3 (25 C)
Density
1.1532 g/cm3 (20 C)
Solubility in water
Slightly soluble
Surface tension
38.48 g/s2 (15 C)
Refractive index
1.4439 (20 C)
Partition coefficient, pKow
1.50
Heat of vaporization
44.1 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Store in a cool, dry place. Store in a tightly closed container. Corrosives area.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Do not ingest or inhale. Discard contaminated shoes. 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
Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions. 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. Provide ventilation.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong acids, strong bases, and strong reducing agents. Explosive reaction with 1-methylsilacyclopenta-2,4-diene at 150 C. Octakis(trifluorophosphine)dirhodium catalyzes explosive polymerization of the acid above 20 C.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
86
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Combustible Liquid. Containers may explode if exposed to fire. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Use agent most appropriate to extinguish fire. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
3
Exposure effects
Chronic inhalation and ingestion may cause effects similar to those of acute inhalation and ingestion.
   Ingestion
Causes gastrointestinal tract burns. May cause methemoglobinemia, cyanosis, convulsions, and death.
   Inhalation
May cause cyanosis, characterized by bluish-colored skin. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
   Skin
Causes skin burns.
   Eyes
Causes eye burns. Lachrymator.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
   Eyes
Immediately 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
2810
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
HS Code
2917 19 90