Pyridazine
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| Names | |||
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Preferred IUPAC name
Pyridazine
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| Other names
1,2-Diazine
Orthodiazine Oizine |
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| Identifiers | |||
289-80-5 
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| 3D model (Jmol) | Interactive image | ||
| ChEBI |
CHEBI:30954
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| ChEMBL |
ChEMBL15719
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| ChemSpider |
8902
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| ECHA InfoCard | 100.005.478 | ||
| EC Number | 206-025-5 | ||
| PubChem | 9259 | ||
| RTECS number | GY2390000 | ||
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| Properties | |||
| C4H4N2 | |||
| Molar mass | 80.09 g/mol | ||
| Appearance | colorless liquid | ||
| Density | 1.107 g/cm3 | ||
| Melting point | −8 °C (18 °F; 265 K) | ||
| Boiling point | 208 °C (406 °F; 481 K) | ||
| miscible | |||
| Solubility | miscible in dioxane, ethanol soluble in benzene, diethyl ether negligible in cyclohexane, ligroin |
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Refractive index (nD)
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1.52311 (23.5 °C) | ||
| Thermochemistry | |||
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Std enthalpy of
formation (ΔfH |
224.9 kJ/mol | ||
| Hazards | |||
| Flash point | 85 °C (185 °F; 358 K) | ||
| Related compounds | |||
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Related compounds
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pyridine, pyrimidine, pyrazine | ||
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is  ?) |
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| Infobox references | |||
Pyridazine is a heterocyclic organic compound with the molecular formula (CH)4N2. It contains a six-membered ring with two adjacent nitrogen atoms, and is aromatic. It is a colorless liquid with a boiling point of 208 °C. It is isomeric with two other (CH)4N2 rings, pyrimidine and pyrazine.
Pyridazines are rare in nature, possibly reflecting the scarcity of naturally occurring hydrazines, common building blocks for the synthesis of these heterocycles. The pyridazine structure is a popular pharmacophore which is found within a number of herbicides such as credazine, pyridafol and pyridate. It is also found within the structure of several drugs such as cefozopran, cadralazine, minaprine, pipofezine, and hydralazine.
In the course of his classic investigation on the Fischer indole synthesis, Emil Fischer prepared the first pyridazine via the condensation of phenylhydrazine and levulinic acid. The parent heterocycle was first prepared by oxidation of benzocinnoline to the pyridazinetetracarboxylic acid followed by decarboxylation. A better route to this otherwise esoteric compound starts with the maleic hydrazide. These heterocycles are often prepared via condensation of 1,4-diketones or 4-ketoacids with hydrazines.
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