O-Cresolphthalein CAS 596-27-0

CAS: 596-27-0

Molecular Formula: C22H18O4

Molecular Weight: 346.38

EINECS: 209-881-8

Synonyms: 3’,3’’-dimethyl-phenolphthalei; cresolphthalein; Di-o-Cresolphthalide; o-Cresolphalein; o-cresolphtaleine; 3,3-bis(4-hydroxy-3-methylphenyl)-1(3h)-isobenzofuranon; 3,3-Bis(4-hydroxy-3-methylphenyl)-1-(3H)-iso-benzofuranone

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What is O-Cresolphthalein CAS 596-27-0?

O-cresol phthalein is a white to light yellow crystalline powder. Melting point 216 ~ 217℃. Soluble in alcohol, ether and glacial acetic acid, slightly soluble in water, insoluble in benzene, soluble in dilute alkali. Used as an acid-base indicator in analytical chemistry. It has similar chemical structure and physical and chemical properties to phenolphthalein, and its color discoloration range is 8.2(colorless)-9.8(red)(Phenolphthalein color discoloration range is 8.2-10). Its acid structure is colorless lactone form, and its base structure is quinone form and appears red.

Specification

Item	Specification
Melting point	223-225 °C
Boiling point	401.12°C (rough estimate)
Density	1.1425 (rough estimate)
Refractive index	1.4400 (estimate)
pKa	9.40(at 25℃)