3,6-dichloropyridazine structural formula

3,6-dichloropyridazine structural formula

Structural formula

Business number 03TX
Molecular formula C4H2Cl2N2
Molecular weight 148.98





Numbering system

CAS number:141-30-0

MDL number:MFCD00006466

EINECS number:205-478-6

RTECS number:UR5886250

BRN number:111151

PubChem ID:None

Physical property data

1. Properties: White flaky crystals

2. Density (g/mL, 25/4℃): 0.8290

3. Melting point (℃): 68

4. Boiling point (ºC, normal pressure): 89-91

5. Refractive index: 1.4346

6. Solubility: Very soluble in acetone and Chloroform, slightly soluble in water and ether.

Toxicological data

1. Acute toxicity: Rat oral LD50: >50 mg/kg

2. Inhalation toxicity: Rat: >1070 mg/m3/4H

Ecological data

1. Other harmful effects: This substance may be harmful to the environment, and special attention should be paid to water bodies.

Molecular structure data

1. Molar refractive index: 32.22

2. Molar volume (cm3/mol): 99.7

3. Isotonic specific volume (90.2K): 267.3

4. Surface tension (dyne/cm): 51.5

5. Polarizability (10-24cm3): 12.77

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): None

2. Number of hydrogen bond donors: 0

3. Number of hydrogen bond acceptors: 2

4. Number of rotatable chemical bonds: 0

5. Number of tautomers: none

6. Topological molecule polar surface area 25.8

7. Number of heavy atoms: 8

8. Surface charge: 0

9. Complexity: 68.4

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the number of chemical bond stereocenters: 0

14. Number of uncertain chemical bond stereocenters: 0

15. Number of covalent bond units: 1

Properties and stability

Stable under normal temperature and pressure

Toxic substances. Harmful if inhaled, toxic if swallowed, irritating to eyes, respiratory tract and skin. Do not inhale the dust. If it comes into contact with your eyes, rinse immediately with plenty of water and seek medical treatment. Use appropriate gloves and protective glasses or a face mask. If you have an accident or feel unwell, seek medical advice immediately (it is best to bring the product container label with you).

Storage method

Stored under freezing conditions

Synthesis method

Obtained from maleic anhydride through ring expansion and chlorination.


1. 3,6-Dichloropyridazine is mainly used in the synthesis of Salazodine and SulfachlorideSulfachlorpyridazine, long-acting sulfonamide (SMP), Sulfamethoxypyridazineacetyl, PSMP, Sulfamazone and Azintamide.

2. Used as pharmaceutical and pesticide intermediates.

3. Used as pharmaceutical intermediates for the production of long-acting sulfonamides.

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