Phthalazone
Phthalazone (CAS: 119-39-1), with the molecular formula C8H6N2O and a molecular weight of 146.15 g/mol, is a heterocyclic organic compound. It serves as a valuable building block in chemical synthesis, particularly within the realm of pyridazine chemistry. This compound is utilised in research and development for the creation of more complex molecular structures and advanced materials.
- IUPAC
- Benzo[d]pyridazin-1(2H)one

Organic Synthesis Intermediate
Phthalazone is employed as a key intermediate in the synthesis of various organic compounds, including pharmaceuticals and agrochemicals. Its pyridazine core allows for diverse chemical modifications.
Heterocyclic Chemistry Research
This compound is a useful reagent for researchers exploring novel heterocyclic systems. Its structure is amenable to further functionalisation, aiding in the discovery of new chemical entities.
Material Science Applications
Phthalazone can be incorporated into the development of new materials, potentially contributing to advancements in areas like polymer science and functional dyes.
| Molecular weight | 146.15 |
|---|---|
| Empirical formula | C8H6N2O |
| Assay | 99% |
| Melting point | 183-185 °C(lit.) |

Hazard statements
- H302Harmful if swallowed
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22 |
| Safety statements (S) | 22-24/25 |
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 Phthalazone used for?
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Phthalazone (CAS: 119-39-1) is used as a building block in organic synthesis and heterocyclic chemistry research for creating complex molecules.
What are the CAS number and formula for Phthalazone?
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The CAS number for Phthalazone is 119-39-1, and its molecular formula is C8H6N2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Phthalazone with an assay of 99%. We do not represent this product as USP, BP, or EP grade.
How should Phthalazone be handled safely?
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Phthalazone is classified as harmful if swallowed (H302). It is recommended to use a dust mask type N95 (US), eyeshields, face shields, and gloves. Avoid breathing dust. Ensure proper ventilation during handling.
Can Tech Serve Solutions export Phthalazone?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including Phthalazone.
How can I request a sample or quote for Phthalazone?
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Please contact our sales team via our website or phone to request a sample or a quotation for Phthalazone.
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