m-Cresol purple

Name: m-Cresol purple
Brand: Vaqora Chemicals
SKU: VQ-000384

About m-Cresol purple

Listed under CAS 2303-01-7, m-Cresol purple is an indicator available from Vaqora Chemicals. Its molecular formula is C21H18O5S and its molecular weight is 382.4 g/mol. The IUPAC name is 4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]-3-methylphenol. Alternative names: m-Cresolsulfonphthalein and Cresol purple.

It is supplied as a dark red to dark green powder. Literature values give a melting point of 250-300 °C. Store sealed in a dry, well-ventilated location away from incompatible materials. Good laboratory practice and suitable PPE are recommended during handling.

Typical applications include titration end-point detection, pH determination and analytical testing. It is used across academic and industrial research.

Vaqora Chemicals supplies m-Cresol purple in 1 g, 5 g, 25 g and 100 g packs, each shipped with a Certificate of Analysis (COA), and exports worldwide. A Safety Data Sheet (SDS) and technical specifications are available on request.

Typical applications

Titration end-point detection
pH determination
Analytical testing

Industries

Specifications & identifiers

Chemical identifiers
Product name	m-Cresol purple
Catalogue No.	VQ-000384
CAS Number	2303-01-7
IUPAC name	4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]-3-methylphenol
Molecular formula	C₂₁H₁₈O₅S
Molecular weight	382.4 g/mol
Exact mass	382.0875
HSN code	29349900
InChIKey	OLQIKGSZDTXODA-UHFFFAOYSA-N
SMILES	CC1=C(C=CC(=C1)O)C2(C3=CC=CC=C3S(=O)(=O)O2)C4=C(C=C(C=C4)O)C
PubChem CID	73030

Physical properties
Physical form	Powder
Appearance	Dark red to dark green powder
Melting point	250-300 °C
LogP (XLogP3)	3.7
H-bond donors / acceptors	2 / 5
TPSA	92.2 Å²
Synonyms	m-Cresolsulfonphthalein, Cresol purple, 3-Cresol purple, Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[3-methyl-, Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis(3-methyl-, 3,3-Bis(4-hydroxy-2-methylphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide, m-Cresolsulfonephthalein, Metacresol Purple, meta-Cresol purple, m-Cresol Purple (Technical Grade), m-Cresol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide, 3,3-Bis(4-hydroxy-2-methylphenyl)-2,1lambda~6~-benzoxathiole-1,1(3H)-dione

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 m-Cresol purple?

The CAS Registry Number of m-Cresol purple is 2303-01-7. It is also known as m-Cresolsulfonphthalein, Cresol purple, 3-Cresol purple.

What is the molecular formula and molecular weight of m-Cresol purple?

m-Cresol purple has the molecular formula C21H18O5S and a molecular weight of 382.4 g/mol. Its IUPAC name is 4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]-3-methylphenol.

Which grade and pack sizes of m-Cresol purple can I order?

We supply m-Cresol purple, in 1 g, 5 g, 25 g, 100 g, 5 x 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with m-Cresol purple?

Yes. Every lot of m-Cresol purple 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 m-Cresol purple be shipped internationally?

Yes. We export m-Cresol purple worldwide by air and sea freight or express courier, on EXW, FOB, CIF, CFR or DAP Incoterms, with full export documentation.