α-Naphtholbenzein (pH Indicator), BP/USP/EP/P… 145-50-6

Name: α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur.
Brand: Vaqora Chemicals
SKU: VQ-047204

About α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur.

Listed under CAS 145-50-6, α-Naphtholbenzein (pH Indicator) is a biological stain available from Vaqora Chemicals (BP/USP/EP/Ph. Eur. grade). The compound has the formula C27H18O2, corresponding to a molecular weight of 374.4 g/mol. The IUPAC name is (4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one. It is also known as p-Naphtholbenzein or alphaNaphtholbenzein.

Keep the container tightly sealed and store it in a cool, dry area. It carries the GHS signal word “Warning” with 3 hazard statements. Review the Safety Data Sheet before use.

Key uses span histology and cytology staining, microscopy and clinical laboratories. Typical end-use sectors are academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

We offer α-Naphtholbenzein (pH Indicator) in 5 g and 25 g packs with a batch-specific COA, and ship to customers worldwide. SDS and detailed specification sheets can be requested with your quotation.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur.
Catalogue No.	VQ-047204
CAS Number	145-50-6
IUPAC name	(4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one
Molecular formula	C₂₇H₁₈O₂
Molecular weight	374.4 g/mol
Exact mass	374.1307
Grade	BP/USP/EP/Ph. Eur.
HSN code	29145000
InChIKey	VDDWRTZCUJCDJM-SOYKGTTHSA-N
SMILES	C1=CC=C(C=C1)/C(=C\2/C=CC(=O)C3=CC=CC=C23)/C4=CC=C(C5=CC=CC=C54)O
PubChem CID	3033966

Physical properties
Physical form	Other
LogP (XLogP3)	6.6
H-bond donors / acceptors	1 / 2
TPSA	37.3 Å²
Synonyms	p-Naphtholbenzein, 1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]-, 1(4H)-Naphthalenone, 4-((4-hydroxy-1-naphthalenyl)phenylmethylene)-, alphaNaphtholbenzein, 4(alpha(4Hydroxy1naphthyl)benzylidene)naphthalen1(4H)one, 1(4H)Naphthalenone, 4(alpha(4hydroxy1naphthyl)benzylidene), 1(4H)Naphthalenone, 4((4hydroxy1naphthalenyl)phenylmethylene), 1(4H)Naphthalenone, 4(alpha(4hydroxy1naphthyl)benzylidene) (8CI), 1-Naphtholbenzein, 4-[(4-Hydroxy-1-naphthalenyl)phenylmethylene]-1(4H)-naphthalenone, Naphtholbenzein, .alpha.-Naphtholbenzein

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 145-50-6

α-Naphtholbenzein (pH Indicator)

CAS: 145-50-6
Formula: C₂₇H₁₈O₂
MW: 374.4 g/mol

VQ-000741

AR

α-Naphtholbenzein (pH Indicator), AR

CAS: 145-50-6
Formula: C₂₇H₁₈O₂
MW: 374.4 g/mol

VQ-045977

Frequently asked questions

What is the CAS number of α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur.?

The CAS Registry Number of α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur. is 145-50-6. It is also known as p-Naphtholbenzein, 1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]-, 1(4H)-Naphthalenone, 4-((4-hydroxy-1-naphthalenyl)phenylmethylene)-.

What is the molecular formula and molecular weight of α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur.?

α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur. has the molecular formula C27H18O2 and a molecular weight of 374.4 g/mol. Its IUPAC name is (4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one.

Which grade and pack sizes of α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur. can I order?

We supply α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur. in BP/USP/EP/Ph. Eur. grade, in 5 g, 25 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur.?

Yes. Every lot of α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur. 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-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur. be shipped internationally?

Yes. α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur. 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.