1-Phthalazinone

Name: 1-Phthalazinone
Brand: Vaqora Chemicals
SKU: VQ-031075

About 1-Phthalazinone

Vaqora Chemicals supplies 1-Phthalazinone, a high-purity reference standard of Hydralazine registered under CAS number 20055-18-9. Formula C8H6N2O, molecular weight 146.15 g/mol. The IUPAC name is 2H-phthalazin-1-one. Common synonyms include Phthalazin-1(2H)-one and Phthalazone.

The product is provided as a solid. Store the standard in its sealed vial, protected from light and moisture, and follow the storage condition printed on the COA. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

As a reference sample of Hydralazine, it is used for identification, assay and impurity-profiling work during analytical method development, validation (AMV) and routine QC. It is used across pharmaceutical manufacturing and academic and industrial research.

Available in 10 mg, 25 mg, 50 mg and 100 mg packs, 1-Phthalazinone is dispatched with a Certificate of Analysis (COA) to destinations worldwide.

Typical applications

Identification & assay
Method development & validation
QC reference material
Fine chemical synthesis

Industries

Related to Hydralazine

View every impurity, metabolite and intermediate we list for Hydralazine.

Hydralazine impurities

Specifications & identifiers

Chemical identifiers
Product name	1-Phthalazinone
Catalogue No.	VQ-031075
CAS Number	20055-18-9
IUPAC name	2H-phthalazin-1-one
Molecular formula	C₈H₆N₂O
Molecular weight	146.15 g/mol
Exact mass	146.048
Grade	Reference Standard
HSN code	38229090
InChIKey	IJAPPYDYQCXOEF-UHFFFAOYSA-N
SMILES	C1=CC=C2C(=C1)C=NNC2=O
PubChem CID	8394

Physical properties
Physical form	Solid
LogP (XLogP3)	0.8
H-bond donors / acceptors	1 / 2
TPSA	41.5 Å²
Synonyms	Phthalazin-1(2H)-one, Phthalazone, Phthalazin-1-one, 1-Phthalazinol, Phthalazinone, phthalazin-1-ol, 1-Hydroxyphthalazine, 1(2H)Phthalazinone, 1,2-dihydrophthalazin-1-one, 1-oxophthalazine, (2H)-phthalazinone, Benzo[d]pyridazin-1(2H)one

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H302Harmful if swallowed

Precautionary statements: P264, P270, P301 + P317, P330, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of 1-Phthalazinone?

The CAS Registry Number of 1-Phthalazinone is 20055-18-9. It is also known as Phthalazin-1(2H)-one, Phthalazone, Phthalazin-1-one.

What is the molecular formula and molecular weight of 1-Phthalazinone?

1-Phthalazinone has the molecular formula C8H6N2O and a molecular weight of 146.15 g/mol. Its IUPAC name is 2H-phthalazin-1-one.

What is 1-Phthalazinone used for?

1-Phthalazinone is supplied as a characterised reference material related to Hydralazine. It is used for analytical method development and validation (AMV), impurity profiling, stability studies and quality control, and in ANDA/DMF regulatory filings.

Which grade and pack sizes of 1-Phthalazinone can I order?

We supply 1-Phthalazinone in Reference Standard grade, in 10 mg, 25 mg, 50 mg, 100 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with 1-Phthalazinone?

Yes. Every lot of 1-Phthalazinone is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can 1-Phthalazinone be shipped internationally?

Yes. 1-Phthalazinone is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.