2,4,5-Trichloro-3(2H)-pyridazinone
2,4,5-Trichloro-3(2H)-pyridazinone (CAS 89089-14-5, C4HCl3N2O) is a halogenated heterocyclic organic compound with a molecular weight of 199.42 g/mol. It functions as an effective electrophilic chlorinating reagent. This compound is particularly noted for its efficacy in the chlorination of bithiophenes. Available from Tech Serve Solutions, it is supplied with a minimum purity of 96%.
- IUPAC
- 2,4,5-Trichloro-2,3-dihydropyridazin-3-one,2,4,5-Trichloro-2H-pyridazin-3-one
- Synonyms
- 89089-14-5C4HCl3N2O2,4,5-Trichloro-2,3-dihydropyridazin-3-one2,4,5-Trichloro-2H-pyridazin-3-one

Electrophilic Chlorination
2,4,5-Trichloro-3(2H)-pyridazinone serves as a potent electrophilic chlorinating reagent. Its reactivity profile makes it suitable for introducing chlorine atoms into organic molecules under specific reaction conditions.
Bithiophene Chlorination
This compound demonstrates particular effectiveness in the chlorination of bithiophenes. This specific application highlights its utility in modifying sulfur-containing heterocyclic systems.
Organic Synthesis Building Block
As a halogenated organic compound and a pyridazinone derivative, it can be employed as a building block in complex organic synthesis. Its structure offers multiple sites for further chemical transformations.
| Molecular weight | 199.42 |
|---|---|
| Empirical formula | C4HCl3N2O |
| Assay | 96% |
| Application | Electrophilic chlorinating reagent, particully effective for the chlorination of bithiophenes1 |
| Melting point | 144-150 °C |

Hazard statements
- H301Toxic if swallowed
Precautionary statements
- P301IF SWALLOWED
| Transport (UN / ADR) | UN 2811 6.1 / PGIII |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 25 |
| Safety statements (S) | 45 |
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 2,4,5-Trichloro-3(2H)-pyridazinone used for?
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2,4,5-Trichloro-3(2H)-pyridazinone is primarily used as an electrophilic chlorinating reagent, notably effective for the chlorination of bithiophenes in organic synthesis.
What is the CAS number and molecular formula for 2,4,5-Trichloro-3(2H)-pyridazinone?
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The CAS number is 89089-14-5 and the molecular formula is C4HCl3N2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2,4,5-Trichloro-3(2H)-pyridazinone with a minimum assay of 96%. It is not represented as USP, BP, EP, or pharmacopoeia grade.
How should 2,4,5-Trichloro-3(2H)-pyridazinone be handled safely?
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2,4,5-Trichloro-3(2H)-pyridazinone is classified as Danger with hazard statement H301 (Toxic if swallowed). Handle with appropriate personal protective equipment in a well-ventilated area. Refer to the Safety Data Sheet for full handling instructions.
Is 2,4,5-Trichloro-3(2H)-pyridazinone a controlled substance?
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The provided data does not indicate that 2,4,5-Trichloro-3(2H)-pyridazinone is a controlled substance.
How can I request a quote or sample?
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To request a quote or sample of 2,4,5-Trichloro-3(2H)-pyridazinone, please contact the Tech Serve Solutions sales team via the website or designated contact channels.
How is 2,4,5-Trichloro-3(2H)-pyridazinone shipped?
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Shipments of 2,4,5-Trichloro-3(2H)-pyridazinone adhere to international regulations for hazardous materials (UN 2811, Class 6.1, Packing Group III). Export documentation and compliance are managed by Tech Serve Solutions.
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