O-Cresol red

Similarly o-sulphobeiizoic anhydride and o-cresol yields o-cresolsulphone-phthalein (o-cresol red) dibromination of the last-named gives dibromo-o-sulphonephthaleln (bromocresol purple) ... 

Cotton wool (absorbent), 143 Coumarin, 707, 713 p-Cresol, 595, 614, 664, 667 o-Cresol red, 989, 990 Critical solution temperature, 17-20 application to determination of water in alcohols, 20, 21... 

Bromcresol Purple. 4,4 -<3H-2rI Benzoxathiob3-ylidene)bis[2-bromo 6-tnethy(phenolJ S, 5-dioxide a-(S-bro ma 4-hydroxy m tolyI) a -<3-6romo-5-mefhyi-4-oxo-2,5-cy-clohexadien-l-ylidene)-o-toluenesulfonic acid 5,5 -drbro-mo-o-cresolsulfonphthalein. C H Br-OcS mol wt 540-24. C 46.68%, H 2.99%. Br 29.59%, O 14.81%, S 5.94%. Prepd by treating o-cresol red with bromine in glacial acetic acid See refs under Bromcresol Green. 

Other Names Phenol, 4,4 -(3H-2,l-benzoxathiol-3-ylidene)fci5 [2-methyl-, 5, 5-dioxide o-Cresol, 4,4 -(3H-2,l-benzoxathiol-3-ylidene)di-, 5,5-dioxide o-Cresolsulfonephthalein o-Toluenesul-fonic acid, a-hydroxy-a,a- (4-hydroxy-m-tolyl)-, y-sultone 3H-2,l-Benzoxathiole, phenol derivative 3, 3"-Dimethylphenolsulfonephthalein Cresol red Cresolsnlfophthalein NSC 7224 o-Cresol Red o-Cresolsulfonphthalein... 

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