Phthalazine

Phthalazine^[1]
Names
	Preferred IUPAC name Phthalazine
	Other names Benzo-orthodiazine; 2,3-Benzodiazine; Benzo[d]pyridazine
Identifiers
CAS Number	253-52-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	8852 ;
ECHA InfoCard	100.005.422
PubChem CID	9207;
UNII	91Y28DM24N ;
CompTox Dashboard (EPA)	DTXSID9049407 ;
	InChI InChI=1S/C8H6N2/c1-2-4-8-6-10-9-5-7(8)3-1/h1-6H Key: LFSXCDWNBUNEEM-UHFFFAOYSA-N ; InChI=1/C8H6N2/c1-2-4-8-6-10-9-5-7(8)3-1/h1-6H Key: LFSXCDWNBUNEEM-UHFFFAOYAE;
	SMILES C1=CC=C2C=NN=CC2=C1;
Properties
Chemical formula	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)
Solubility in water	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). verify (what is ?) Infobox references

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.

^ Merck Index, 11th Edition, 7344.
^ Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 212. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
^ Brown, H.C., et al., in Baude, E.A. and Nachod, F.C., Determination of Organic Structures by Physical Methods, Academic Press, New York, 1955.

Names


Preferred IUPAC name Phthalazine^[2]
Other names Benzo-orthodiazine 2,3-Benzodiazine Benzo[d]pyridazine
Identifiers
CAS Number	253-52-1^Y
3D model (JSmol)	Interactive image
ChemSpider	8852^N
ECHA InfoCard	100.005.422
PubChem CID	9207
UNII	91Y28DM24N^Y
CompTox Dashboard (EPA)	DTXSID9049407
InChI 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
SMILES C1=CC=C2C=NN=CC2=C1
Properties
Chemical formula	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)
Solubility in water	Miscible
Acidity (pK_a)	3.39^[3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references