Indazole-5-carboxaldehyde
Indazole-5-carboxaldehyde (CAS: 253801-04-6), with the molecular formula C8H6N2O and a molecular weight of 146.15 g/mol, is a heterocyclic organic building block. This aldehyde derivative of indazole is primarily utilized in chemical synthesis and research laboratories as a versatile intermediate. Its structure allows for diverse reactions, making it valuable in the development of novel compounds within various scientific disciplines.
- IUPAC
- 5-Formyl-1H-indazole
- Synonyms
- 5-Formyl-1H-indazole

Organic Synthesis Intermediate
Indazole-5-carboxaldehyde serves as a key intermediate in the synthesis of more complex organic molecules. The aldehyde functional group and the indazole core provide reactive sites for various chemical transformations.
Pharmaceutical Research
This compound is employed in medicinal chemistry research for the development of potential new drug candidates. Its structural motif is found in various biologically active compounds.
Materials Science
The unique structural properties of indazole derivatives can be exploited in the development of novel materials with specific electronic or optical characteristics.
Chemical Reagent
As a fine chemical, Indazole-5-carboxaldehyde is used as a reagent in academic and industrial research laboratories for a wide range of synthetic purposes.
| Molecular weight | 146.15 |
|---|---|
| Empirical formula | C8H6N2O |
| Assay | 96% |
| Melting point | 115-119 °C |

Hazard statements
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Indazole-5-carboxaldehyde used for?
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Indazole-5-carboxaldehyde is primarily used as an intermediate in organic synthesis, particularly in pharmaceutical research and the development of novel chemical entities. It is also employed as a general chemical reagent in research laboratories.
What are the CAS number and formula for Indazole-5-carboxaldehyde?
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The CAS number is 253801-04-6, and the empirical formula is C8H6N2O.
What grade and purity does Tech Serve Solutions supply for Indazole-5-carboxaldehyde?
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Tech Serve Solutions supplies Indazole-5-carboxaldehyde with an assay of 96%. We do not represent this product as USP, BP, EP, or any other pharmacopoeia grade. For specific requirements, please contact our sales team.
How should Indazole-5-carboxaldehyde be handled safely?
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Indazole-5-carboxaldehyde is classified as a Warning with hazard statement H319 (Causes serious eye irritation). Appropriate personal protective equipment, including eyeshields and gloves, should be worn. A type N95 (US) or type P1 (EN143) respirator filter is recommended. Always consult the Safety Data Sheet (SDS) before handling.
Is Indazole-5-carboxaldehyde a controlled substance?
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Based on the provided data, there is no indication that Indazole-5-carboxaldehyde is a controlled substance.
How is Indazole-5-carboxaldehyde packaged and shipped?
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Indazole-5-carboxaldehyde is carefully packaged to ensure safe transit and is exported globally by Tech Serve Solutions. For detailed packaging and shipping information, please contact our customer service.
How can I request a quote or sample for Indazole-5-carboxaldehyde?
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To request a quote or a sample of Indazole-5-carboxaldehyde, please visit the product page on our website or contact our sales department directly.
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