Orcinol

  • 5-Methylresorcinol
  • 3,5-Dihydroxytoluene
  • 5-Methyl-1,3-benzenediol
  • 3-Hydroxy-5-methylphenol
  • 1,5-Dihydroxy-3-methylbenzene
Formula
C7H8O2
Structure
Description
Off-white crystals.
Uses
Used as a a reagent for pentoses, lignin, beet sugar, saccharoses, arabinose, diastase.

Registry Numbers and Inventories.
CAS
504-15-4
EC (EINECS/ELINCS)
207-984-2
R 22 36/37/38
RTECS
VH2100000
RTECS class
Other
UN (DOT)
2811
Merck
12,6995
Beilstein/Gmelin
1071903
Beilstein Reference
4-06-00-05892
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C7H8O2
Formula mass
124.14
Melting point, °C
109
Boiling point, °C
289 - 290
Vapor pressure, mmHg
0.0012 (25 C)
Density
1.2895 g/cm3
Solubility in water
Slightly soluble
Refractive index
1.5403
pKa/pKb
9.52 (pKa)
Partition coefficient, pKow
1.22
Heat of fusion
16.7 kJ/mol
Heat of vaporization
55.1 kJ/mol
Heat of combustion
-3453 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from light and air. Store under an inert atmosphere.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Store protected from light. Handle under an inert atmosphere. Store protected from air.
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
Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation. Place under an inert atmosphere.
Disposal code
3
Stability
Stable under normal temperatures and pressures. Substance may discolor on exposure to light.
Incompatibilities
Air, strong oxidizing agents, acid chlorides, acid anhydrides.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
144
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. Extinguishing media: Use extinguishing media most appropriate for the surrounding fire. In case of fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract. May be harmful if swallowed. Ingestion may cause convulsions, seizures and possible coma.
   Inhalation
Causes respiratory tract irritation. Causes irritation of the mucous membrane.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation. May cause eye injury.

First aid
 
   Ingestion
Get medical aid. If conscious drink water, then induce vomiting. If unconscious, immediately take victim to a physician and do NOT attempt to induce vomiting. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
   Skin
Get medical aid if irritation develops or persists. Wash clothing before reuse. Flush skin with plenty of soap and water.
   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
2811
Response guide
HS Code
2907 29 00