4-Methoxybenzenethiol

  • 4-Methoxyphenylthiol
  • 4-Mercaptoanisole
  • 4-Methoxythiophenol
  • p-Methoxyphenylthiol
  • p-Methoxyphenyl mercaptan
  • p-Methoxybenzenethiol
Formula
C7H8OS
Structure
Description
Clear yellow liquid. With a stench.

Registry Numbers and Inventories.
CAS
696-63-9
EC (EINECS/ELINCS)
211-799-2
R 20/21/22 36/38
S 26 36/37/39
RTECS
DC1800000
RTECS class
Other
UN (DOT)
2810
Beilstein/Gmelin
1446910
Beilstein Reference
4-06-00-05790
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C7H8OS
Formula mass
140.19
Melting point, °C
42
Boiling point, °C
228
Density
1.1397 g/cm3
Solubility in water
Slightly soluble
Refractive index
1.5822 (22 C)
pKa/pKb
6.75 (pKa)

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container.
Handling
Wash thoroughly after handling. Avoid contact with skin and eyes. Avoid ingestion and inhalation. Use only in a chemical fume hood.
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.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents, strong bases.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide.

Fire.
Flash Point,°C
96
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. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
   Inhalation
Causes respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. 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.
   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
2810
Response guide