Structural Formula Vector Image
Title: Thymolphthalein
CAS Registry Number: 125-20-2
CAS Name: 3,3-Bis[4-hydroxy-2-methyl-5-(1-methylethyl)phenyl]-1(3H)-isobenzofuranone
Additional Names: 5¢,5¢¢-diisopropyl-2¢,2¢¢-dimethylphenolphthalein
Molecular Formula: C28H30O4
Molecular Weight: 430.54
Percent Composition: C 78.11%, H 7.02%, O 14.86%
Literature References: Obtained by heating phthalic anhydride with thymol at 110° in the presence of stannic chloride.
Properties: Needles, mp ~253°. Insol in water; sol in alcohol, acetone; also sol in dil alkalies with a blue color, in H2SO4 with a carmine-red color.
Melting point: mp ~253°
Use: As pH indicator: colorless 9.3 to blue 10.5. Also as reagent for blood after decolorizing the alkaline soln by boiling with zinc dust.

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