5-Methyl-2,4-dihydro-3H-pyrazol-3-one

Name: 5-Methyl-2,4-dihydro-3H-pyrazol-3-one
Brand: Vaqora Chemicals
SKU: VQ-032974

About 5-Methyl-2,4-dihydro-3H-pyrazol-3-one

Listed under CAS 108-26-9, 5-Methyl-2,4-dihydro-3H-pyrazol-3-one is an API impurity reference standard available from Vaqora Chemicals. Its molecular formula is C4H6N2O and its molecular weight is 98.1 g/mol. Systematically, it is named 3-methyl-1,4-dihydropyrazol-5-one. Alternative names: 3-Methyl-1H-Pyrazol-5(4H)-one and 3-Methyl-5-pyrazolone.

It is supplied as a solid. Store the standard in its sealed vial, protected from light and moisture, and follow the storage condition printed on the COA. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

As a characterised impurity of the parent drug substance, it is used for analytical method development, method validation (AMV) and routine quality-control testing, and it supports ANDA and DMF regulatory filings. Buyers come mainly from pharmaceutical manufacturing and academic and industrial research.

Standard pack sizes are 10 mg, 25 mg, 50 mg and 100 mg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Analytical method development
Method validation (AMV)
QC release testing
ANDA / DMF filings

Industries

Specifications & identifiers

Chemical identifiers
Product name	5-Methyl-2,4-dihydro-3H-pyrazol-3-one
Catalogue No.	VQ-032974
CAS Number	108-26-9
IUPAC name	3-methyl-1,4-dihydropyrazol-5-one
Molecular formula	C₄H₆N₂O
Molecular weight	98.1 g/mol
Exact mass	98.048
Grade	Reference Standard
HSN code	38229090
InChIKey	NHLAPJMCARJFOG-UHFFFAOYSA-N
SMILES	CC1=NNC(=O)C1
PubChem CID	7920

Physical properties
Physical form	Solid
LogP (XLogP3)	-0.5
H-bond donors / acceptors	1 / 2
TPSA	41.5 Å²
Synonyms	3-Methyl-1H-Pyrazol-5(4H)-one, 3-Methyl-5-pyrazolone, 3-Methyl-2-pyrazolin-5-one, 3H-Pyrazol-3-one, 2,4-dihydro-5-methyl-, 2,4-Dihydro-5-methyl-3H-pyrazol-3-one, 3-methyl-4,5-dihydro-1H-pyrazol-5-one, 3-Methyl-pyrazolon-(5), 3Me5Oxopyrazol, 3-methyl-1H-pyrazoline-5-one, 5-methyl-2,4-dihydropyrazol-3-one

Safety & hazard information (GHS)

Environmental hazard

Signal word: Warning

Hazard statements

H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects

Precautionary statements: P273, P391, 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 5-Methyl-2,4-dihydro-3H-pyrazol-3-one?

The CAS Registry Number of 5-Methyl-2,4-dihydro-3H-pyrazol-3-one is 108-26-9. It is also known as 3-Methyl-1H-Pyrazol-5(4H)-one, 3-Methyl-5-pyrazolone, 3-Methyl-2-pyrazolin-5-one.

What is the molecular formula and molecular weight of 5-Methyl-2,4-dihydro-3H-pyrazol-3-one?

5-Methyl-2,4-dihydro-3H-pyrazol-3-one has the molecular formula C4H6N2O and a molecular weight of 98.1 g/mol. Its IUPAC name is 3-methyl-1,4-dihydropyrazol-5-one.

Which grade and pack sizes of 5-Methyl-2,4-dihydro-3H-pyrazol-3-one can I order?

We supply 5-Methyl-2,4-dihydro-3H-pyrazol-3-one 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 5-Methyl-2,4-dihydro-3H-pyrazol-3-one?

Yes. Every lot of 5-Methyl-2,4-dihydro-3H-pyrazol-3-one 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 5-Methyl-2,4-dihydro-3H-pyrazol-3-one be shipped internationally?

Yes. 5-Methyl-2,4-dihydro-3H-pyrazol-3-one 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.