Description

Indole-5-carboxylic acid (CAS No. 1670-81-1) is a high-purity heterocyclic organic compound with the molecular formula C₉H₇NO₂. This white to off-white crystalline powder is a key building block in pharmaceutical, agrochemical, and material science research. As a derivative of indole, it features a carboxylic acid functional group at the 5-position, making it valuable for further synthetic modifications. With a molecular weight of 161.16 g/mol, this compound is soluble in organic solvents like DMSO and ethanol but has limited solubility in water. Our product is rigorously tested to ensure ≥98% purity (HPLC) and is supplied with comprehensive analytical data including ¹H NMR and LC-MS spectra. Proper storage at 2-8°C in a tightly sealed container is recommended to maintain stability.

Properties

• CAS Number: 1670-81-1
• Complexity: 193
• IUPAC Name: 1H-indole-5-carboxylic acid
• InChI: InChI=1S/C9H7NO2/c11-9(12)7-1-2-8-6(5-7)3-4-10-8/h1-5,10H,(H,11,12)
• InChI Key: IENZCGNHSIMFJE-UHFFFAOYSA-N
• Exact Mass: 161.047678466
• Molecular Formula: C9H7NO2
• Molecular Weight: 161.16
• SMILES: C1=CC2=C(C=CN2)C=C1C(=O)O
• Topological: 53.1
• Monoisotopic Mass: 161.047678466
• Synonyms: Indole-5-carboxylic acid, 1H-indole-5-carboxylic acid, 1670-81-1, 5-indolecarboxylic acid, EINECS 216-799-6, CHEBI:131778, DTXSID80168218, DTXCID5090709, 216-799-6, 5-Carboxyindole, 142396-03-0, MFCD00005678, Indole-5-carboxylic acid, 98%, CHEMBL2018158, 5-Carboxyindole;, 1H-Indole-5-carboxylic acid, radical ion(1+), 4ZV, indol-5-carboxylic acid, 5-indole carboxylic acid, Indole 5-carboxylic acid, 1H-Indole-5-carboxylicacid, SCHEMBL105928, SCHEMBL4493688, SCHEMBL6447473, SCHEMBL9739328, Indole-5-carboxylic acid, 99%, BCP27354, CS-D1057, STR02571, BDBM50195791, SBB003951, STK503793, AKOS000265424, AC-3143, CG-0516, FI01415, SB10481, NCGC00342345-01, HY-59302, Indole-5-carboxylic acid, ~95% (TLC), SY004023, DB-031744, DB-291410, I0029, NS00025469, ST50406361, EN300-69795, AB00443749-03, AN-584/41714898, Indole-5-carboxylic acid, purum, >=98.0% (T), Q27455355, F2158-1505, Z1118536235, InChI=1/C9H7NO2/c11-9(12)7-1-2-8-6(5-7)3-4-10-8/h1-5,10H,(H,11,12

Application

Indole-5-carboxylic acid serves as a versatile intermediate in organic synthesis, particularly in the development of pharmaceutical compounds targeting serotonin receptors. Researchers utilize this compound in the synthesis of tryptophan derivatives and other biologically active indole alkaloids. Its carboxylic acid functionality makes it valuable for peptide coupling reactions and metal-organic framework (MOF) construction. The compound also finds application in material science as a precursor for conductive polymers and organic electronic materials.

Safety and Hazards

GHS Hazard Statements

• H302 (25%): Harmful if swallowed [Warning Acute toxicity, oral]
• H312 (25%): Harmful in contact with skin [Warning Acute toxicity, dermal]
• H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]
• H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H335 (87.5%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statements

• P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501

Hazard Classes and Categories

• Acute Tox. 4 (25%)
• Acute Tox. 4 (25%)
• Skin Irrit. 2 (100%)
• Eye Irrit. 2A (100%)
• STOT SE 3 (87.5%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.