4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol 181696-73-1

Name: 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol
Brand: Vaqora Chemicals
SKU: VQ-033066

About 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol

4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol is an impurity of Parecoxib carrying the CAS registry number 181696-73-1. The compound has the formula C16H15NO2, corresponding to a molecular weight of 253.29 g/mol. Its systematic (IUPAC) name is 5-methyl-3,4-diphenyl-4H-1,2-oxazol-5-ol. Alternative names: Parecoxib-001 and 5-Hydroxy-5-methyl-3,4-diphenylisoxazoline.

It is supplied as a solid. Reference materials should be stored sealed and away from light and moisture, as specified on the accompanying COA. It carries the GHS signal word “Warning” with 1 hazard statement. Review the Safety Data Sheet before use.

Pharmaceutical QC and development laboratories use this impurity standard of Parecoxib to develop and validate HPLC methods, to set specification limits and to document impurity profiles in ANDA and DMF submissions. Typical end-use sectors are pharmaceutical manufacturing and academic and industrial research.

Vaqora Chemicals supplies 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol in 10 mg, 25 mg, 50 mg and 100 mg packs, each shipped with a Certificate of Analysis (COA), and exports worldwide.

Typical applications

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

Industries

Related to Parecoxib

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

Parecoxib impurities

Specifications & identifiers

Chemical identifiers
Product name	4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol
Catalogue No.	VQ-033066
CAS Number	181696-73-1
IUPAC name	5-methyl-3,4-diphenyl-4H-1,2-oxazol-5-ol
Molecular formula	C₁₆H₁₅NO₂
Molecular weight	253.29 g/mol
Exact mass	253.1103
Grade	Reference Standard
HSN code	38229090
InChIKey	LOFHVOCXHGAVHL-UHFFFAOYSA-N
SMILES	CC1(C(C(=NO1)C2=CC=CC=C2)C3=CC=CC=C3)O
PubChem CID	10777254

Physical properties
Physical form	Solid
LogP (XLogP3)	3.1
H-bond donors / acceptors	1 / 3
TPSA	41.8 Å²
Synonyms	5-Methyl-3,4-diphenyl-4,5-dihydro-1,2-oxazol-5-ol, 5-Isoxazolol, 4,5-dihydro-5-methyl-3,4-diphenyl-, 5-Isoxazolol,4,5-dihydro-5-methyl-3,4-diphenyl-, Parecoxib-001, 5-Hydroxy-5-methyl-3,4-diphenylisoxazoline, 3,4-diphenyl4-hydrido-5-hydroxy-5-methylisoxazole, (5S)-5-Methyl-3,4-diphenyl-4,5-dihydroisoxazol-5-ol

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H317May cause an allergic skin reaction

Precautionary statements: P261, P272, P280, P302 + P352, P321, P333 + P317, P362 + P364, 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 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol?

The CAS Registry Number of 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol is 181696-73-1. It is also known as 5-Methyl-3,4-diphenyl-4,5-dihydro-1,2-oxazol-5-ol, 5-Isoxazolol, 4,5-dihydro-5-methyl-3,4-diphenyl-, 5-Isoxazolol,4,5-dihydro-5-methyl-3,4-diphenyl-.

What is the molecular formula and molecular weight of 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol?

4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol has the molecular formula C16H15NO2 and a molecular weight of 253.29 g/mol. Its IUPAC name is 5-methyl-3,4-diphenyl-4H-1,2-oxazol-5-ol.

What is 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol used for?

4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol is supplied as a characterised reference material related to Parecoxib. 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 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol can I order?

We supply 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol 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 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol?

Yes. Every lot of 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol 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 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol be shipped internationally?

Yes. 4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol 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.