Thymolphthalein is an acid-base (pH) indicator. Its transition range is at approximately pH 9.3-10.5. Below this pH, it is colorless; above this pH, it is blue. The molar extinction coefficient for the blue thymolphthalein dianion is 38000 M-1cm-1 at 595 nm. ==Preparation== Thymolphthalein can be synthesized from thymol and phthalic anhydride via ...
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http://en.wikipedia.org/wiki/Thymolphthalein
<chemical> 5',5''-diisopropyl-2',2''-dimethylphenolphthalein. Used as a pH indicator and as a reagent for blood after decolorizing the alkaline solution by boiling with zinc dust. ... Pharmacological action: indicators and reagents, phthalein dyes. ... Chemical name: 1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxy-2-methyl-5-(1-methylethyl)phenyl)-...
Found on
http://www.encyclo.co.uk/local/20973
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