Phthalazine

Phthalazine, also called benzo-orthodiazine or benzopyridazine, is a heterocyclic organic compound with the molecular formula C8H6N2. It is isomeric with other naphthyridines including quinoxaline, cinnoline and quinazoline.

Phthalazine
Names
Preferred IUPAC name
Phthalazine
Other names
Benzo-orthodiazine
2,3-Benzodiazine
Benzo[d]pyridazine
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.005.422
UNII
  • InChI=1S/C8H6N2/c1-2-4-8-6-10-9-5-7(8)3-1/h1-6H N
    Key: LFSXCDWNBUNEEM-UHFFFAOYSA-N N
  • InChI=1/C8H6N2/c1-2-4-8-6-10-9-5-7(8)3-1/h1-6H
    Key: LFSXCDWNBUNEEM-UHFFFAOYAE
  • C1=CC=C2C=NN=CC2=C1
Properties
C8H6N2
Molar mass 130.150 g·mol−1
Appearance Pale yellow needles
Melting point 90 to 91 °C (194 to 196 °F; 363 to 364 K)
Boiling point 315 to 317 °C (599 to 603 °F; 588 to 590 K) (decomposition)
Miscible
Acidity (pKa) 3.39
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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