Pyrocatechol violet

Name: Pyrocatechol violet
Brand: Vaqora Chemicals
SKU: VQ-000406

About Pyrocatechol violet

Listed under CAS 115-41-3, Pyrocatechol violet is an indicator available from Vaqora Chemicals in AR grade. With the molecular formula C19H14O7S, it has a molar mass of 386.4 g/mol. Systematically, it is named 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]benzene-1,2-diol. It is also known as Catechol violet or Pyrocatecholsulfonphthalein.

In its supplied form it is a purple to dark purple to violet powder. Literature values give a melting point of 185 °C (dec.) and a density of ~1.57 (Predicted). Keep the container tightly sealed and store it in a cool, dry area. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

It is commonly used for titration end-point detection, pH determination and analytical testing. It is used across academic and industrial research.

Vaqora Chemicals supplies Pyrocatechol violet in 1 g, 5 g, 25 g and 1 kg packs, each shipped with a Certificate of Analysis (COA), and exports worldwide.

Typical applications

Titration end-point detection
pH determination
Analytical testing

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Pyrocatechol violet
Catalogue No.	VQ-000406
CAS Number	115-41-3
IUPAC name	4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]benzene-1,2-diol
Molecular formula	C₁₉H₁₄O₇S
Molecular weight	386.4 g/mol
Exact mass	386.046
Grade	AR
HSN code	29072990
InChIKey	RRRCKIRSVQAAAS-UHFFFAOYSA-N
SMILES	C1=CC=C2C(=C1)C(OS2(=O)=O)(C3=CC(=C(C=C3)O)O)C4=CC(=C(C=C4)O)O
PubChem CID	66993

Physical properties
Physical form	Powder
Appearance	Purple to dark purple to violet powder
Melting point	185 °C (dec.)
Density	~1.57 (Predicted)
LogP (XLogP3)	2.3
H-bond donors / acceptors	4 / 7
TPSA	133 Å²
Synonyms	Catechol violet, Pyrocatecholsulfonphthalein, 1,2-Benzenediol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-, Pyrocatechinsulfonephthalein, Pyrocatechol sulfonphthalein, 3,3-bis(3,4-dihydroxyphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide, 4,4'-(1,1-Dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[1,2-benzenediol], starbld0016674, Catechol violet indicator, 3H-2,1-Benzoxathiole, 3,3-bis(3,4-dihydroxyphenyl)-, 1,1-dioxide, 1,2-Benzenediol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, S,S-dioxide, 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1$l^{6}-benzoxathiol-3-yl]benzene-1,2-diol

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements: P261, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, 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

Other grades of CAS 115-41-3

Pyrocatechol violet

CAS: 115-41-3
Formula: C₁₉H₁₄O₇S
MW: 386.4 g/mol

VQ-045979

Frequently asked questions

What is the CAS number of Pyrocatechol violet?

The CAS Registry Number of Pyrocatechol violet is 115-41-3. It is also known as Catechol violet, Pyrocatecholsulfonphthalein, 1,2-Benzenediol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-.

What is the molecular formula and molecular weight of Pyrocatechol violet?

Pyrocatechol violet has the molecular formula C19H14O7S and a molecular weight of 386.4 g/mol. Its IUPAC name is 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]benzene-1,2-diol.

Which grade and pack sizes of Pyrocatechol violet can I order?

We supply Pyrocatechol violet in AR grade, in 1 g, 5 g, 25 g, 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Pyrocatechol violet?

Yes. Every lot of Pyrocatechol violet 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 Pyrocatechol violet be shipped internationally?

Yes. Pyrocatechol violet 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.