C28H18O4
418.4 g/mol
Research ReagentWarning
Alpha-Naphtholphthalein
CAS596-01-0EC209-875-5
Category
Research Reagent
Compound Class
Aromatic
Primary Use
Research Compound
alpha-Naphtholphthalein is a phthalein dye commonly used as a pH indicator, exhibiting a visual color transition from colorless or reddish to greenish blue in the pH range of 7. 3 to 8.
pH indicator for titration and analytical chemistry
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
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Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for Alpha-Naphtholphthalein (CAS 596-01-0) is 2932.20.
HS code (international, 6-digit)
2932.20
EU CN code (8-digit)
2932 20 90
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one
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
Synonyms (24)
- .alpha.-Naphtholphthaleine
- 1,1'-NAPHTHOL-4,4'-PHTHALEIN
- 1-Naphtholphthalein
- Naphtholphthalein
- P-.ALPHA.-NAPHTHOLPHTHALEIN
- a-Naphtolphtalein
- a-naphtholphthalein
- alpha-Naphtholphthalein
- naphtholphthalein blue
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