2-Methyl-1,4-benzoquinone

  • Methylbenzoquinone
  • Methyl-p-benzoquinone
  • 2-Methyl-p-Benzoquinone
  • Methyl-1,4-benzoquinone
  • 2-Methylbenzoquinone
  • 2-Methylbenzoquinone-1,4
Formula
2-(CH3)-4-(O=)C6H3(=O)
Structure
Description
Yellow plates or needles.

Registry Numbers and Inventories.
CAS
553-97-9
EC (EINECS/ELINCS)
209-056-2
EC Class
toxic, irritant
R 25 36/38
S 26 37 45
RTECS
DK6300000
RTECS class
Agricultural Chemical and Pesticide; Mutagen
UN (DOT)
1325
Beilstein/Gmelin
9172366
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C7H6O2
Formula mass
122.12
Melting point, °C
65 - 67
Boiling point, °C
187
Vapor pressure, mmHg
0.66 (25 C)
Density
1.08 g/cm3 (75.5 C)
Solubility in water
Slightly soluble
Surface tension
33.86 g/s2 (77 C)
Refractive index
1.5049 (78 C)
Partition coefficient, pKow
0.72
Heat of vaporization
42.3 kJ/mol
Heat of combustion
-3372 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Use with adequate ventilation.
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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Disposal code
9
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
65
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. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
Flammable/combustible material. May be ignited by friction, heat, sparks or flames.
Combustion products
Fire may produce irritating and/or toxic gases.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure effects
Effects may be delayed.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Causes respiratory tract irritation. Can produce delayed pulmonary edema.
   Skin
Causes skin irritation. May cause dermatitis. May cause discoloration, erythema, swelling, and the formation of papules and vesicles.
   Eyes
Causes eye irritation. Contact may cause ulceration of the conjunctiva and cornea. May cause chemical conjunctivitis.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.
   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
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1325
Response guide
Hazard class
4.1
Packing Group
II; III
 
HS Code
2914 69 90