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What is Cresol Red CAS 1733-12-6

Views: 1     Author: Site Editor     Publish Time: 29-08-2022      Origin: Site



Melting point: 290℃

Boiling point: 479.59℃ (rough estimate)

Density: 0.998 g/cm3

Refractive index: 1.5300 (estimate)


CAS 1733-12-6


The crystal with green luster is reddish brown powder after grinding. Soluble in alcohol and dilute sodium hydroxide solution, slightly soluble in water.


Acid base reminder. Prepare 0.1% solution or 0.04% aqueous solution with 20% ethanol (take 0.04g of the product and dissolve it in 1.05ml of 0.1mnaoh solution), and then dilute it to 100ml. PH discoloration range: 7.2 (yellow) - 8.8 (purple); 2.0 (red) - 3.0 (Amber).

Production method

Mix benzenesulphonic anhydride, o-cresol and anhydrous zinc chloride, stir and heat, condense at 115-120 ℃ for about 7h, and purge the remaining o-cresol with steam. Filter, dissolve the filter cake with hot sodium carbonate aqueous solution, filter, neutralize with 1:1 hydrochloric acid in the clear filtrate, and stir vigorously. The crystals were filtered out, washed with a small amount of water and dried to obtain the finished product. If necessary, it can be purified by recrystallization of glacial acetic acid.


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