What is Indole CAS 120-72-9?

Indole CAS 120-72-9 is an aromatic nitrogen-containing fused-ring compound with the formula C8H7N and molecular weight 117.15 g/mol. It is a crystalline solid at room temperature and an important intermediate for fragrance and chemical synthesis.

Why does Indole smell different at high and low concentrations?

In concentrated form indole has a strong, pungent or animalic odor. At very low dilution it becomes a floral jasmine-like and orange-blossom note, which is why it is used in very small amounts in fine fragrance and personal-care compositions.

What are the main fragrance applications of Indole CAS 120-72-9?

It is used as a fragrance ingredient and fixative in accords such as jasmine, lilac, lotus and orchid. Typical perfumery use is at low levels, because the concentrated odor is intense and unpleasant.

Can Indole be used as a pharmaceutical or agrochemical intermediate?

Yes. Indole is a key building block for synthesizing indole-containing pharmaceuticals, plant-growth regulators and agrochemicals. Its bicyclic indole ring is found in many biologically active molecules.

What are the main specifications and storage precautions?

Typical export specifications are white to shiny flake crystals or powder, GC assay at least 99%, melting point 51-54 C, boiling point 253-254 C and low moisture. Store it sealed in a cool, dry place, protected from light and air because indole can discolor on prolonged exposure.

Indole CAS 120-72-9

Indole, CAS 120-72-9, is an aromatic nitrogen-containing fused-ring compound supplied for fragrance, pharmaceutical and agrochemical synthesis. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 120-72-9
Synonyms: 1H-Indole, 1-Azaindene, 2,3-Benzopyrrole, Ketole, Benzopyrrole
Einecs: 204-420-7
Molecular Formula: C₈H₇N
Grade: Industrial Grade / Perfumery Grade
Package: 25kg/Fiber Drum, lined with plastic bag (or customized per request)

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Product Description

Indole, CAS 120-72-9, is an aromatic nitrogen-containing fused-ring compound.

Synonyms: 1H-Indole; 1-Azaindene; 2,3-Benzopyrrole; Ketole; Benzopyrrole.

CAS: 120-72-9.

It has the molecular formula C8H7N and molecular weight 117.15 g/mol.

It appears as white to shiny flake crystals or powder.

It has a GC assay of at least 99.0% and a melting point of about 51.0–54.0 °C.

It is soluble in hot water, ethanol, ether and benzene, but almost insoluble in cold water.

At high concentration it has a strong pungent odor, while at low dilution it gives a floral jasmine-like note.

It is used as a fragrance ingredient and fixative in jasmine, lilac, lotus and orchid accords.

It is used in daily chemical essences such as soaps and detergents.

It is a precursor for synthesizing tryptophan and anti-inflammatory drugs such as indomethacin.

It is used to synthesize indole-3-acetic acid and indole-3-butyric acid plant growth regulators.

It is used in the production of tryptophan-based dyes.

It turns red on prolonged exposure to light and air, so it must be stored in light-resistant containers.

Confirm appearance, assay, melting point, boiling point, moisture, residue on ignition, solubility, flash point and density.

Store sealed in a cool, dry, well-ventilated place below 30 °C, away from strong oxidizers, iron and strong acids.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required grade and specification, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Indole CAS 120-72-9?

A: Indole CAS 120-72-9 is an aromatic nitrogen-containing fused-ring compound with the formula C8H7N and molecular weight 117.15 g/mol. It is a crystalline solid at room temperature and an important intermediate for fragrance and chemical synthesis.
Q:
Why does Indole smell different at high and low concentrations?

A: In concentrated form indole has a strong, pungent or animalic odor. At very low dilution it becomes a floral jasmine-like and orange-blossom note, which is why it is used in very small amounts in fine fragrance and personal-care compositions.
Q:
What are the main fragrance applications of Indole CAS 120-72-9?

A: It is used as a fragrance ingredient and fixative in accords such as jasmine, lilac, lotus and orchid. Typical perfumery use is at low levels, because the concentrated odor is intense and unpleasant.
Q:
Can Indole be used as a pharmaceutical or agrochemical intermediate?

A: Yes. Indole is a key building block for synthesizing indole-containing pharmaceuticals, plant-growth regulators and agrochemicals. Its bicyclic indole ring is found in many biologically active molecules.
Q:
What are the main specifications and storage precautions?

A: Typical export specifications are white to shiny flake crystals or powder, GC assay at least 99%, melting point 51-54 C, boiling point 253-254 C and low moisture. Store it sealed in a cool, dry place, protected from light and air because indole can discolor on prolonged exposure.

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