1,4-Dithiane-2,5-diol

  • p-Dithiane-2,5-diol
  • 2,5-Dihydroxy-1,4-dithiane
  • Mercaptoacetaldehyde dimer
Formula
C4H8O2S2
Structure
Description
White to light yellow crystalline powder. With a stench.

Registry Numbers and Inventories.
CAS
40018-26-6
EC (EINECS/ELINCS)
254-751-6
EC Class
harmful
R 22 41 43
S 26 36/37/39
UN (DOT)
3335
Beilstein/Gmelin
104402
Beilstein Reference
4-01-00-03966
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C4H8O2S2
Formula mass
152.24
Melting point, °C
110
Boiling point, °C
285
Critical temperature
487
Critical pressure
62.4
Solubility in water
Soluble
pKa/pKb
12.04 (pKa)
Partition coefficient, pKow
0.99

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a dry area. Refrigerator (approx 4 C).
Handling
Use with adequate ventilation. Avoid contact with skin and eyes. Do not breathe dust, vapor, mist, or gas. Take precautionary measures against static discharges.
Protection
Skin: Wear appropriate protective gloves and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
Respirators
Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Reduce airborne dust and prevent scattering by moistening with water. Avoid generating dusty conditions. Remove all sources of ignition.
Stability
No data.
Incompatibilities
Strong oxidizing agents, acids, bases.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide.

Fire.
Autoignition, °C
310
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. This material in sufficient quantity and reduced particle size is capable of creating a dust explosion. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.

Health.
Exposure effects
   Ingestion
Harmful if swallowed. May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation. May be harmful if inhaled.
   Skin
May cause skin irritation. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. May be harmful if absorbed through the skin.
   Eyes
May cause eye irritation and possible damage.

First aid
 
   Ingestion
Induce vomiting. Get medical aid. 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.
   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.
UN number
3335
Response guide
HS Code
2934 99 90