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2-Phenylindole

2-Phenylindole

CAS: 948-65-2

Molecular Formula: C14H11N

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2-Phenylindole - Names and Identifiers

Name 2-Phenylindole
Synonyms NSC 15776
2-phenyl-indol
a-Phenylindole
2-Phenylindole
2-PHENYL INDOLE
2-phenyl-1h-indol
2-phenyl-1H-indole
PHENYLINDOL,ALPHA-
1H-Indole,2-phenyl-
potassium 2-phenylindol-1-ide
CAS 948-65-2
EINECS 213-436-3
InChI InChI=1/C14H10N.K/c1-2-6-11(7-3-1)14-10-12-8-4-5-9-13(12)15-14;/h1-10H;/q-1;+1

2-Phenylindole - Physico-chemical Properties

Molecular FormulaC14H11N
Molar Mass193.24
Density1.1061 (rough estimate)
Melting Point188-190 °C (lit.)
Boling Point250 °C/10 mmHg (lit.)
Flash Point250°C/10mm
Solubility almost transparency in Methanol
Vapor Presure7.18E-07mmHg at 25°C
AppearanceWhite to light brown powder
ColorOff-white to beige or slightly green
pKa16.80±0.30(Predicted)
Storage ConditionSealed in dry,Room Temperature
Refractive Index1.5850 (estimate)
MDLMFCD00005608
Physical and Chemical PropertiesYellow or puree red leaf-like crystals.
UseUsed as PVC cellophane stabilizer and dye intermediate

2-Phenylindole - Risk and Safety

Hazard SymbolsXi - Irritant
Irritant
Risk CodesR37/38 - Irritating to respiratory system and skin.
R41 - Risk of serious damage to eyes
Safety DescriptionS26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S39 - Wear eye / face protection.
WGK Germany3
RTECSNM1272500
TSCAYes
HS Code29309090

2-Phenylindole - Nature

Open Data Verified Data

yellow or puree red leaf-like crystals. Melting point of 189 deg C, boiling point above 360c. Soluble in ether, benzene, acetic acid, chloroform and hot carbon disulfide, micro-soluble in hot water, insoluble in dilute inorganic acid. In the air gradient Green, can sublimate.

Last Update：2024-01-02 23:10:35

2-Phenylindole - Preparation Method

Open Data Verified Data

In xylene medium, after condensation with acetophenone and phenylhydrazine, ring closure in the presence of zinc chloride, acid boiling, Suction filtration, water washing and pumping dry to obtain the finished product.

Last Update：2022-01-01 10:53:45

2-Phenylindole - Application

Open Data Verified Data

production of cationic orange 2GL. Cationic red BL, cationic red 2BL and other dyes intermediates.

Last Update：2025-08-19 16:24:40

2-Phenylindole - Safety

Open Data Verified Data
  • toxic. The workplace should be strengthened ventilation, equipment should be sealed, the operator should wear protective equipment.
  • store in a cool and ventilated warehouse, store and transport according to the provisions of toxic chemicals.
Last Update：2025-06-10 22:55:16

2-Phenylindole - Reference Information

NIST chemical information information provided by: webbook.nist.gov (external link)
EPA chemical substance information information provided by: ofmpeb.epa.gov (external link)
Application This product is mainly used as a cationic dye intermediate for the production of cationic orange 2GL, cationic red BL, cationic red 2GL, when used in dye production, it is often first methylated to further prepare n-methyl-2-phenylindole. The methylating agent was dimethyl sulfate, and the reaction was carried out in a chlorobenzene solvent at 60-65 ° C. The yield was 83.5%. 2-phenylindole is also used as a heat stabilizer for emulsion polyvinyl chloride.
used as PVC cellophane stabilizer and dye intermediate
production method 2-phenylindole is prepared by condensing phenylhydrazine with acetophenone and then ring-closing in the presence of zinc chloride. In addition to the Fisher method described above, bromoacetophenone can be heated to react with an excess of aniline, or N-(2-methylphenyl) benzamide and sodium ethoxide can be heated at 360-380 °c in air, 2-phenyl Indole can be prepared. Raw material consumption quota: acetophenone (98%)735kg/t, phenylhydrazine (free 100%)675kg/t, xylene 900kg/t, glacial acetic acid 15kg/t, zinc chloride 1230kg/t, hydrochloric acid (30%)810kg/t.
Last Update：2024-04-09 21:54:55
2-Phenylindole
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