3,6-Dihydroxypyridazine

Description

3,6-Dihydroxypyridazine · CAS 123-33-1 · C4H4N2O2. UNII TQ7L3FCV66. Melting Point: 298-300 °C; Flash Point: 572 °F (300 °C) (Closed cup); Solubility: In water, 4,507 mg/L at 25 °C.

Identification

CAS Registry Number	123-33-1
PubChem CID	21954
Molecular formula	C4H4N2O2
IUPAC name	1,2-dihydropyridazine-3,6-dione
UNII (FDA)	TQ7L3FCV66

Computed Descriptors

Molecular Weight	112.09
XLogP3	-0.8
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	112.027277375
Monoisotopic Mass	112.027277375
Topological Polar Surface Area	58.2
Heavy Atom Count	8
Formal Charge	0

Physical & Chemical Properties

Melting Point	298-300 °C
Flash Point	572 °F (300 °C) (Closed cup)
Solubility	In water, 4,507 mg/L at 25 °C
Density	1.60 at 25 °C
Density	1.6 @25 °C
Vapor Pressure	0.00000277 [mmHg]
Vapor Pressure	7.5X10-8 mm Hg at 25 °C
LogP	-0.63
Decomposition	DT50 (25 °C) 58 days (pH 5, 7), 34 days (pH 9).
Dissociation Constants	pKa = 5.62 at 20 °C

Physical description & handling notes

• Maleic hydrazide is an odorless white solid. Sinks in water. (USCG, 1999)
• Colorless, crystalline solid; [HSDB] White solid; Formulated as emulsifiable concentrate and soluble concentrate (liquid and solid); [Reference #1]
• Crystals from water
• COLORLESS CRYSTALLINE SOLID
• Odorless
• Decomposes (NTP, 1992)

Regulatory Status

GHS notification summary	42.5% (34 / 80)

GHS Hazard Classification

GHS notification summary	42.5% (34 / 80)
Reported hazard statements	H315 (57.5%), H319 (57.5%), H335 (56.2%), H341 (56.2%), H302 (100%)

Documented Uses

• Used as a herbicide and plant growth inhibitor, e.g., to control sucker growth on tobacco and to inhibit sprouting of potatoes and onions; [HSDB] A plant growth regulator and herbicide used to control sprouting of potatoes and onions, suckers in tobacco, and weeds, grasses, and trees in and along turf, ornamentals, public easements, and industrial and commercial land; [Reference #1]
• Experimentally in horticulture and agriculture. ...In synthesis of pyridazine.
• Post-harvest sprouting inhibitor; weed control; sugar content stabilizer in beets.
• Use as over-the-top foliar spray
• For more Uses (Complete) data for MALEIC HYDRAZIDE (13 total), please visit the HSDB record page.
• Herbicides, Plant growth regulators

Synonyms

MALEIC HYDRAZIDE; 123-33-1; 3,6-Dihydroxypyridazine; 3,6-Pyridazinediol; 1,2-Dihydropyridazine-3,6-dione; 3,6-Pyridazinedione, 1,2-dihydro-; 1,2-Dihydro-3,6-pyridazinedione; Maleic acid hydrazide; Stuntman; Vondalhyde; Malzid; Retard; Sucker-Stuff; Antergon; Antyrost; Malazide

Frequently Asked Questions

What are the CAS number and molecular formula of 3,6-Dihydroxypyridazine?

CAS 123-33-1; molecular formula C4H4N2O2; molecular weight — g/mol.

What other names is 3,6-Dihydroxypyridazine known by?

MALEIC HYDRAZIDE, 123-33-1, 3,6-Dihydroxypyridazine, 3,6-Pyridazinediol, 1,2-Dihydropyridazine-3,6-dione, 3,6-Pyridazinedione, 1,2-dihydro-.

Is 3,6-Dihydroxypyridazine classified as hazardous?

42.5% of GHS notifications report no hazard classification (34 of 80).

What are the key physical properties of 3,6-Dihydroxypyridazine?

Melting Point: 298-300 °C; Flash Point: 572 °F (300 °C) (Closed cup); Solubility: In water, 4,507 mg/L at 25 °C; Density: 1.60 at 25 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.