4-Phenyl-1-(2H)-phthalazinone
4-Phenyl-1-(2H)-phthalazinone (CAS: 5004-45-5) is a heterocyclic organic compound with the molecular formula C14H10N2O and a molecular weight of 222.24 g/mol. This chemical serves as a valuable building block in organic synthesis, particularly within the realm of heterocyclic chemistry. Its structure lends itself to the development of novel compounds for research purposes, contributing to advancements in chemical synthesis and related scientific disciplines.

Organic Synthesis Intermediate
4-Phenyl-1-(2H)-phthalazinone functions as a key intermediate in the synthesis of more complex organic molecules. Its reactive sites allow for diverse chemical transformations, making it useful in multi-step synthetic routes.
Heterocyclic Chemistry Research
This compound is employed in academic and industrial research settings focused on pyridazine derivatives and other heterocyclic structures. It aids in exploring new chemical reactions and the properties of novel heterocyclic systems.
Pharmaceutical Intermediate Development
The phthalazinone scaffold is present in various biologically active molecules, suggesting potential utility for 4-Phenyl-1-(2H)-phthalazinone in the early stages of drug discovery and development.
| Molecular weight | 222.24 |
|---|---|
| Empirical formula | C14H10N2O |
| Assay | 97% |
| Melting point | 240-244 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
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 4-Phenyl-1-(2H)-phthalazinone used for?
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4-Phenyl-1-(2H)-phthalazinone is primarily used as a building block in organic synthesis and for research in heterocyclic chemistry, including potential applications in pharmaceutical intermediate development.
What are the CAS number and formula for 4-Phenyl-1-(2H)-phthalazinone?
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The CAS number is 5004-45-5 and the empirical formula is C14H10N2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Phenyl-1-(2H)-phthalazinone with a minimum assay of 97%. We do not represent this product as meeting USP, BP, EP, or other pharmacopoeia standards.
How should 4-Phenyl-1-(2H)-phthalazinone be handled?
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Handle 4-Phenyl-1-(2H)-phthalazinone with appropriate personal protective equipment, including a dust mask (type N95 or equivalent), eyeshields, and gloves. Ensure adequate ventilation and avoid dust formation. It is classified as a Warning with hazards including skin irritation (H315), eye irritation (H319), and respiratory irritation (H335).
Is this chemical exported by TSS?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 4-Phenyl-1-(2H)-phthalazinone.
How can I request a sample or quote?
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To request a sample or a quote for 4-Phenyl-1-(2H)-phthalazinone, please contact our sales team through the website or by phone.
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