5-Isoquinolinesulfonic acid
5-Isoquinolinesulfonic acid (CAS: 27655-40-9, C9H7NO3S) is a heterocyclic compound with a molecular weight of 209.22 g/mol. This substance primarily functions as a building block in chemical synthesis. Its applications are concentrated within organic chemistry research and the development of novel molecular structures. Supplied by Tech Serve Solutions, it is available for various research and development purposes.

Organic Synthesis Intermediate
5-Isoquinolinesulfonic acid serves as a crucial intermediate in the synthesis of complex organic molecules. Its isoquinoline core and sulfonic acid group offer reactive sites for further functionalization in multi-step synthetic pathways.
Peptide Conjugate Research
This compound has been utilised in the synthesis of conjugates involving oligoarginine peptides. Such conjugates are of interest in biochemical research for their potential biological activities and delivery properties.
Heterocyclic Chemistry
As an isoquinoline derivative, it is a valuable reagent for researchers working in heterocyclic chemistry, enabling the construction and modification of nitrogen-containing ring systems.
| Molecular weight | 209.22 |
|---|---|
| Empirical formula | C9H7NO3S |
| Assay | 95% |
| Impurities tested | 2-5% H2SO4 |
| Application | 5-Isoquinolinesulfonic acid was used in the synthesis of conjugates of oligoarginine peptides1. |
| Melting point | >300 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Transport (UN / ADR) | UN 2585 8/PG 3 |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/38 |
| Safety statements (S) | 26 |
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 5-Isoquinolinesulfonic acid used for?
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5-Isoquinolinesulfonic acid is used as a building block in chemical synthesis, notably in the creation of peptide conjugates and within heterocyclic chemistry research.
What is the CAS number and formula for 5-Isoquinolinesulfonic acid?
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The CAS number is 27655-40-9 and the empirical formula is C9H7NO3S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Isoquinolinesulfonic acid with an assay of 95%. Impurities typically consist of 2-5% H2SO4. This product is supplied for research and laboratory use and is not represented as USP, EP, or BP grade.
How should 5-Isoquinolinesulfonic acid be handled safely?
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5-Isoquinolinesulfonic acid is a Warning substance that causes skin irritation (H315) and serious eye irritation (H319). Wear protective gloves and eye protection. In case of contact with eyes, rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Store in a cool, dry, well-ventilated area.
Can Tech Serve Solutions export 5-Isoquinolinesulfonic acid?
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Yes, Tech Serve Solutions is an experienced global supplier and exporter of fine chemicals, including 5-Isoquinolinesulfonic acid, adhering to all relevant shipping regulations.
How can I request a sample or quote for 5-Isoquinolinesulfonic acid?
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To request a sample or a quote, please contact the Tech Serve Solutions sales team via the website or by telephone, providing the product name and CAS number (27655-40-9).
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