o-Pyrocatechualdehyde

  • 2,3-Dihydroxybenzaldehyde
  • 5,6-Dihydroxybenzaldehyde
  • 3-Formyl-1,2-benzenediol
  • 3-Hydroxysalicylaldehyde
  • 1,2-Dihydroxy-3-formylbenzene
Formula
C7H6O3
Structure
Description
Tan to green powder.

Registry Numbers and Inventories.
CAS
24677-78-9
EC (EINECS/ELINCS)
246-398-1
EC Class
irritant
R 36/37/38
Beilstein/Gmelin
2041781
Beilstein Reference
3-08-00-01979
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C7H6O3
Formula mass
138.12
Melting point, °C
103 - 105
Boiling point, °C
235
Vapor pressure, mmHg
0.03 (25 C)
Solubility in water
Slightly soluble
pKa/pKb
7.97 (pKa)
Partition coefficient, pKow
1.35
Heat of vaporization
49.6 kJ/mol

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
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
Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong bases, acid chlorides, acid anhydrides.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
113
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation.
   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.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
HS Code
2912 49 00