3,6-Dihydroxypyridazine

  • Maleic acid hydrazide
  • Maleic hydrazide
  • 3,6-Pyridazinediol
Formula
C4H4N2O2
Structure
Description
Odorless white solid.
Uses
Experimental use: in horticulture & agriculture, in synthesis of pyridazine.

Registry Numbers and Inventories.
CAS
123-33-1
EC (EINECS/ELINCS)
204-619-9
R 36/37/38 40
S 26 36/37/39
RTECS
UR5950000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen
UN (DOT)
2811
Merck
13,5728
Beilstein/Gmelin
112223
Beilstein Reference
5-24-06-00012
RCRA
U148
EPA OPP
98804
Swiss Giftliste 1
G-2377
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C4H4N2O2
Formula mass
112.09
Melting point, °C
292
Decomposition point, °C
302
Odor Threshold Odor threshold Odorless
Density
1.60 g/cm3 (20 C)
Solubility in water
Very soluble
pKa/pKb
9.21 (pKa)
Partition coefficient, pKow
-0.84
Heat of combustion
-2114 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.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong acids, pesticides which are highly alkaline in reaction.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
300
Autoignition, °C
430
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.
Fire potential
Combustible solid.
Combustion products
Toxic nitrogen oxides are produced.

Health.
Poison_Class
4
Exposure effects
Chronic ingestion may cause liver damage.
   Ingestion
May cause irritation of the digestive tract. May cause central nervous system effects.
   Inhalation
Dust is irritating to the respiratory tract.
   Skin
May cause skin irritation.
   Eyes
Dust may cause mechanical 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 if irritation or symptoms occur.
   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
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. If irritation develops, get medical aid.

Transport.
UN number
2811
Response guide
USCG CHRIS Code
MLH
 
HS Code
2933 99 90