CAS Number: 76-61-9
Empirical Formula: C27H30O5S
Molecular Weight: 466.59
IUPAC Name: 4-[9- (4-hydroxy- 2-methyl- 5-propan- 2-yl- phenyl)-7,7- dioxo-8- oxa- 7λ6-thiabicyclo[4.3.0]nona-1,3,5- trien-9- yl]- 5- ethyl- 2- propan-2- yl-phenol
Other Names: α-hydroxy-α,α-bis(5-hydroxycarvacryl)- o- toluenesulfonic acid γ-sultone; thymolsulfonephthalein
Thymol blue (thymolsulphonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. It is insoluble inwater but soluble in alcohol and dilute alkali solutions.
It transitions from red to yellow at pH 1.2–2.8 and from yellow to blue at pH 8.0–9.6. It is usually a component of Universal indicator.
Thymol blue (pH indicator)
below pH 8.0 above pH 9.6
8.0 ↔ 9.6
Thymol blue (pH indicator)
below pH 1.2
1.2 ↔
