o-Cresolphthalein (White)
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Name
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o-Cresolphthalein
(White)
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Synonyms
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3,3-Bis(4-hydroxy-3-methylphenyl)-1(3H)-isobenzofuranone
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Molecular Structure
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Molecular Formula
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C
22
H
18
O
4
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Molecular Weight
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346.38
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CAS Registry Number
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596-27-0
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EINECS
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209-881-8
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Properties
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Melting point
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223-225 ÂșC
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Water solubility
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slightly soluble
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Chemical Property/Description:
1. Physical properties:
o-Cresolphthalein (White)
is a white to light yellow crystalline powder with good solubility, soluble in ethanol, ether and other organic solvents, slightly soluble in water
and acidic solutions.
2. Chemic
al properties:o-Cresolphthalein (White)
is an acid-base indicator, and its color changes with the change of pH value. In acidic environment,
o-Cresolphthalein (White)
is colorless. In neutral or appears red. This property makes it used as an acid-base indicator in many chemical experiments.alkaline en
vironments.
Main Uses:
1. Acid-base indicator
: Because the color of
o-Cresolphthalein (White)
changes with the change of pH value, it is commonly used as an acid-base indicator. In the chemical experiment, by observing the color change of
o-Cresolphthalein (White)
, we can judge whether the chemical reaction has reached the end point, so as to control the experimental process.
2. Pharmaceutical intermediates:
o-Cresolphthalein (White)
can b
e used as a pharmaceutical intermediate for the synthesis of antibacterial drugs, antipyretic analgesics and other drugs. For example,
o-crephenolphthalein can be used in the synthesis of non-steroidal anti-inflammatory drugs such as aspirin.
3. Dye intermediates:
o-Cresolphthalein (White)
can also be used to synthesize dye intermediates, such as cationic dyes, acid dyes, etc. These dyes are widely used in textile, printing and dyeing, papermaking and other industries.
Detailed Photos