C8H6N2O
146.15 g/mol
Pharmaceutical IntermediateWarning
1(2H)-PHTHALAZINONE
CAS119-39-1EC204-319-8
Category
Pharmaceutical Intermediate
Compound Class
Heterocycle
Primary Use
Pharmaceutical Intermediate
This compound is a phthalazinone derivative and serves as a chemical intermediate in the synthesis of hydralazine, an antihypertensive agent. Its structure features a bicyclic ring system containing both aromatic and heterocyclic components.
Chemical intermediate for hydralazine synthesis
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
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1-Phenyl-1,2-propanedione-2-oxime
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CAS1190-94-9
pharmaceutical intermediate
Safety Reference
Warning
H302Harmful if swallowed
Customs Tariff Classification
The international HS code for 1(2H)-PHTHALAZINONE (CAS 119-39-1) is 2933.99.
HS code (international, 6-digit)
2933.99
EU CN code (8-digit)
2933 99 80
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
2H-phthalazin-1-one
InChIKey
IJAPPYDYQCXOEF-UHFFFAOYSA-N
SMILES
C1=CC=C2C(=C1)C=NNC2=O
Synonyms (16)
- (2H)-phthalazinone
- 1(2H)-PHTHALAZINONE
- 1,2-dihydrophthalazin-1-one
- 1-Hydroxyphthalazine
- 1-Phthalazinol
- 1-oxophthalazine
- 1-phthalazinone
- 2-hydrophthalazin-1-one
- 2H-Phthalazin-1-one
- Benzo[d]pyridazin-1(2H)one
- Hydralazine Hydroxy Impurity
- Phthalazin-1(2H)-one
- Phthalazine-1(2H)-one
- Phthalazinone
- Phthalazone
- phthalazine, 1-hydroxy-
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