Maleic hydrazide

Maleic Hydrazide (CAS No. 123-33-1) 

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1. Basic Information

Chemical Name: Maleic hydrazideSynonyms: 1,2-Dihydropyridazine-3,6-dione; MHCAS Number: 123-33-1Molecular Formula: C₄H₄N₂O₂Molecular Weight: 112.09 g/molAppearance: White crystalline powderOdor: Odorless

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2. Physical and Chemical Properties

Property	Value
Melting Point	260–265°C (decomposes)
Solubility	– Water: 6 g/L (25°C)
	– Organic solvents: Insoluble in most (e.g., ethanol, acetone)
pH (1% solution)	5.5–7.0
Vapor Pressure	Negligible (<0.1 mPa at 20°C)
Stability	Stable under normal conditions

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3. Chemical Structure

       O        ║     N---C    //   \\   N     C=O    \\   //     C---C        ║        O

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4. Hazards (GHS Classification)

Acute Toxicity:Oral LD₅₀ (rat): >5,000 mg/kg (Category 5)Dermal LD₅₀ (rabbit): >2,000 mg/kgEnvironmental:Not classified as hazardous (EC₅₀ >100 mg/L for aquatic organisms)NFPA Rating: Health 1, Flammability 0, Reactivity 0

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5. Storage and Handling

Storage:Keep in tightly closed containers at room temperatureProtect from moisture and direct sunlightHandling:Use standard lab PPE (gloves, goggles)Avoid dust formation

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6. Applications

Plant Growth Regulator:Inhibits sprouting in potatoes, onions, and tobaccoApplied at 10–50 ppm in agricultureHerbicide: Controls grasses and weeds in non-crop areasResearch: Used to study cell division inhibition in plants

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