5-Cyanophthalide
5-Cyanophthalide (CAS: 82104-74-3, Formula: C9H5NO2) is a heterocyclic organic compound with a molecular weight of 159.14 g/mol. It serves as a valuable building block in organic synthesis, particularly for the construction of more complex molecules. Its specific structure makes it a useful intermediate in the development of novel chemical entities within research and development settings.
- IUPAC
- 1,3-Dihydro-1-oxo-5-isobenzofurancarbonitrile,5-Cyano-3H-isobenzofuranone
- Synonyms
- 1,3-Dihydro-1-oxo-5-isobenzofurancarbonitrile5-Cyano-3H-isobenzofuranone

Organic Synthesis Intermediate
5-Cyanophthalide is employed as a key intermediate in multi-step synthetic routes. Its reactivity allows for functional group transformations and the elaboration of carbon frameworks.
Research and Development
This compound is utilised in academic and industrial research for the exploration of new chemical structures and reactions. It is particularly useful in the synthesis of benzofuran derivatives and related heterocyclic systems.
Fine Chemical Manufacturing
As a building block, 5-Cyanophthalide contributes to the manufacturing of specialised fine chemicals. Its availability supports the scalable production of advanced intermediates.
| Molecular weight | 159.14 |
|---|---|
| Empirical formula | C9H5NO2 |
| Assay | 97% |
| Melting point | 201-205 °C(lit.) |

Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H332Harmful if inhaled
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22 |
| Safety statements (S) | 36/37 |
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-Cyanophthalide used for?
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5-Cyanophthalide is primarily used as an intermediate in organic synthesis and in research and development for creating novel chemical structures, particularly benzofuran derivatives.
What is the CAS number and formula for 5-Cyanophthalide?
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The CAS number is 82104-74-3 and the molecular formula is C9H5NO2.
What grade and purity does Tech Serve Solutions supply for 5-Cyanophthalide?
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Tech Serve Solutions supplies 5-Cyanophthalide with an assay of 97%. This product is intended for laboratory and research use and is not supplied as USP, BP, EP, or pharmaceutical grade.
What are the main hazards associated with 5-Cyanophthalide?
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5-Cyanophthalide is classified with the GHS symbol GHS07 and signal word Warning. It carries hazard statements H302 (Harmful if swallowed), H312 (Harmful in contact with skin), and H332 (Harmful if inhaled). Appropriate personal protective equipment including a dust mask type N95, eyeshields, and gloves should be worn.
How is 5-Cyanophthalide packed and shipped?
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5-Cyanophthalide is carefully packed to ensure its integrity during transit. Tech Serve Solutions exports this chemical globally, adhering to relevant shipping regulations.
How can I request a quote or sample for 5-Cyanophthalide?
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To request a quote or sample of 5-Cyanophthalide, please contact our sales team through the website or by phone, providing your details and requirements.
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