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EINECS 206-025-5
CAS No. 289-80-5 Density 1.055 g/cm3
PSA 25.78000 LogP 0.47660
Solubility Miscible with water Melting Point -8 °C(lit.)
Formula C4H4N2 Boiling Point 207.999 °C at 760 mmHg
Molecular Weight 80.0892 Flash Point 85 °C
Transport Information N/A Appearance Clear yellowish-brown liquid
Safety 23-24/25 Risk Codes 36/37/38
Molecular Structure Molecular Structure of 289-80-5 (Pyridazine) Hazard Symbols Xn


Article Data 54

Pyridazine Specification

The IUPAC name of this product is pyridazine. With the CAS registry number 289-80-5, it is also named as 1,2-Diazabenzene; Orthodiazine. The product's categories are heterocycles, organoborons, pyridazine, building blocks, heterocyclic building blocks and pyridazines. In addiotion, it is clear yellowish-brown liquid which is miscible with water.

The other characteristics of this product can be summarized as: (1)ACD/LogP: -0.77; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -0.77; (4)ACD/LogD (pH 7.4): -0.77; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 9.07; (8)ACD/KOC (pH 7.4): 9.08; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 0; (12)Index of Refraction: 1.503; (13)Molar Refractivity: 22.43 cm3; (14)Molar Volume: 75.8 cm3; (15)Polarizability: 8.89×10-24 cm3; (16)Surface Tension: 44.1 dyne/cm; (17)Enthalpy of Vaporization: 42.61 kJ/mol; (18)Vapour Pressure: 0.315 mmHg at 25°C; (19)Exact Mass: 80.037448; (20)MonoIsotopic Mass: 80.037448; (21)Topological Polar Surface Area: 25.8; (22)Heavy Atom Count: 6; (23)Complexity: 30.5.

Preparation of Pyridazine: It can be obtained by 4,4-diethoxy-3-hydroxy-butyraldehyde with hydrazyne sulfate in the solvent methanol and H2O at 50 °C. The reaction time is 18 hours. The yield is 80%.

Uses of Pyridazine: It is mainly used in research and industry as building block for more complex compounds. It is also supposed to be used as organic intermediate. For example: It can react with diphenyl-cyclopropenone to get 6,7-diphenyl-pyrrolo[1,2-b]pyridazin-5-ol. This reaction needs solvent 1,2-dichloro-ethane by heating. The reaction time is 2 hours.

When you are using this chemical, please be cautious about it as the following:
It is irritating to eyes, respiratory system and skin, so people should not breathe vapour and avoid contact with skin and eyes.

People can use the following data to convert to the molecule structure. 
1. SMILES: n1ncccc1;
2. InChI: InChI=1/C4H4N2/c1-2-4-6-5-3-1/h1-4H.

The following is the toxicity data which has been tested.

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 intraperitoneal 2650mg/kg (2650mg/kg)   Progress in Biochemical Pharmacology. Vol. 1, Pg. 542, 1965.

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