C28H30O4
430.5 g/mol
Dye & PigmentDanger
Thymophthalein
CAS125-20-2EC204-729-7
Category
Dye & Pigment
Compound Class
Heterocycle
Primary Use
pH indicator dye
Thymolphthalein is a phthalein dye primarily used as an acid-base pH indicator. It transitions from colorless to blue in the pH range of approximately 9.
pH indicator dyeAcid-base titration indicator
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
ApplicationSame Use
Bromocresol green
CAS76-60-8
pH indicator dye
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Bromcresol purple
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pH indicator dye
ReferenceSame Category
4-{[4-(Dimethylamino)phenyl][(²H₅)phenyl]methylidene}-N,N-dimethylcyclohexa-2,5-dien-1-iminium 2,4,6-trinitrophenolate
CAS1258668-21-1
isotopically labeled dye reference standard
ReferenceSame Category
Pigment Red 104
CAS12656-85-8
Pigment for paints and plastics
ReferenceSame Category
[4-[[4-[bis(trideuteriomethyl)amino]phenyl]-[4-(dimethylamino)phenyl]methylidene]cyclohexa-2,5-dien-1-ylidene]-dimethylazanium;chloride
CAS1266676-01-0
deuterated dye for analytical reference
ReferenceSame Category
Acid Yellow 151
CAS12715-61-6
acid dye for textiles
Referencesame scaffold
O-cresolphthalein
CAS596-27-0
pH indicator for titrations
Referencesame scaffold
Phenolphthaleina
CAS77-09-8
pharmaceutical raw material
Safety Reference
Danger
H341Suspected of causing genetic defects
H350May cause cancer
H361Suspected of damaging fertility or the unborn child
Customs Tariff Classification
The international HS code for Thymophthalein (CAS 125-20-2) 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-hydroxy-2-methyl-5-propan-2-ylphenyl)-2-benzofuran-1-one
InChIKey
LDKDGDIWEUUXSH-UHFFFAOYSA-N
SMILES
CC1=CC(=C(C=C1C2(C3=CC=CC=C3C(=O)O2)C4=CC(=C(C=C4C)O)C(C)C)C(C)C)O
Synonyms (30)
- Thymolphthalein
- Thymolphthalein solution
- Thymolphthalein, p.a.
- Thymophthalein
- pH Indicator (9.3-10.5)
- thymolphthaleine
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