α-Naphthol phthalein

Name: α-Naphthol phthalein
Brand: Vaqora Chemicals
SKU: VQ-000427

About α-Naphthol phthalein

Listed under CAS 596-01-0, α-Naphthol phthalein is an indicator available from Vaqora Chemicals. With the molecular formula C28H18O4, it has a molar mass of 418.4 g/mol. Systematically, it is named 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one. It is also known as a-Naphtholphthalein or alpha-Naphtholphthalein.

In its supplied form it is a light pink to beige to red-brown powder. Store sealed in a dry, well-ventilated location away from incompatible materials. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

Key uses span titration end-point detection, pH determination, analytical testing and fluorescent labelling. Our customers for this product work in academic and industrial research and electronics and semiconductors.

Standard pack sizes are 1 g, 5 g, 25 g and 100 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Titration end-point detection
pH determination
Analytical testing
Fluorescent labelling

Industries

Specifications & identifiers

Chemical identifiers
Product name	α-Naphthol phthalein
Catalogue No.	VQ-000427
CAS Number	596-01-0
IUPAC name	3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one
Molecular formula	C₂₈H₁₈O₄
Molecular weight	418.4 g/mol
Exact mass	418.1205
HSN code	29322990
InChIKey	HQHBAGKIEAOSNM-UHFFFAOYSA-N
SMILES	C1=CC=C2C(=C1)C(=CC=C2O)C3(C4=CC=CC=C4C(=O)O3)C5=CC=C(C6=CC=CC=C65)O
PubChem CID	68993

Physical properties
Physical form	Powder
Appearance	Light pink to beige to red-brown powder
LogP (XLogP3)	6.3
H-bond donors / acceptors	2 / 4
TPSA	66.8 Å²
Synonyms	a-Naphtholphthalein, alpha-Naphtholphthalein, Naphtholphthalein, 3,3-Bis(4-hydroxy-1-naphthyl)phthalide, 1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxy-1-naphthalenyl)-, 1-Naphtholphthalein, 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, 3,3-bis(4-hydroxynaphthalen-1-yl)-1,3-dihydro-2-benzofuran-1-one, A-Naphtholphthalein, naphtholphthalein blue, a-Naphtolphtalein, .alpha. Naphtholphthalein

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 596-01-0

AR

α-Naphthol phthalein, AR

CAS: 596-01-0
Formula: C₂₈H₁₈O₄
MW: 418.4 g/mol

VQ-045976

Frequently asked questions

What is the CAS number of α-Naphthol phthalein?

The CAS Registry Number of α-Naphthol phthalein is 596-01-0. It is also known as a-Naphtholphthalein, alpha-Naphtholphthalein, Naphtholphthalein.

What is the molecular formula and molecular weight of α-Naphthol phthalein?

α-Naphthol phthalein has the molecular formula C28H18O4 and a molecular weight of 418.4 g/mol. Its IUPAC name is 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one.

Which grade and pack sizes of α-Naphthol phthalein can I order?

We supply α-Naphthol phthalein, in 1 g, 5 g, 25 g, 100 g, 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with α-Naphthol phthalein?

Yes. Every lot of α-Naphthol phthalein 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 α-Naphthol phthalein be shipped internationally?

Yes. α-Naphthol phthalein 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.