3,4-Dichloro-1,2,5-thiadiazole
3,4-Dichloro-1,2,5-thiadiazole (CAS: 5728-20-1; Formula: C2Cl2N2S) is a halogenated heterocyclic compound with a molecular weight of 155.01 g/mol. This chemical serves as a valuable building block in organic synthesis, particularly in the preparation of complex thiadiazole derivatives. Its applications include its use as a guest molecule in solid-state NMR studies and in the synthesis of piperazine-containing thiadiazole compounds. Tech Serve Solutions supplies this reagent for research and development purposes.
- Synonyms
- 5-thiadiazoleC2Cl2N2S

Solid-State NMR Investigations
3,4-Dichloro-1,2,5-thiadiazole has been utilized as a guest molecule to study the solid-state 13C NMR spectra of inclusion compounds. This research aids in understanding molecular interactions within crystalline structures.
Synthesis of Heterocyclic Compounds
This compound is employed in the preparation of novel [1,2,5]thiadiazol-3-yl-piperazine derivatives. These structures are of interest for their potential pharmacological properties.
Chemical Synthesis Building Block
As a halogenated heterocycle, 3,4-Dichloro-1,2,5-thiadiazole acts as a versatile intermediate in the synthesis of more complex organic molecules.
| Molecular weight | 155.01 |
|---|---|
| Empirical formula | C2Cl2N2S |
| Assay | 97% |
| Boiling point | 158 °C(lit.) |
| Density | 1.648 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.561(lit.) |
| Application | 3,4-Dichloro-1,2,5-thiadiazole has been employed:• as guest molecule to investigate solid-state 13C NMR spectra of inclusion compounds of 2,6-dimethyl-bicyclo[3.3.1]nonane-exo-2-exo-6-diol with small organic molecules1• in preparation of [1,2,5]thiadiazol-3-yl-piperazine compounds2 |

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 | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-37/39 |
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 are the primary uses of 3,4-Dichloro-1,2,5-thiadiazole?
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3,4-Dichloro-1,2,5-thiadiazole is primarily used as a building block in chemical synthesis, notably in the preparation of heterocyclic compounds and for solid-state NMR studies of inclusion complexes.
What is the CAS number and molecular formula for 3,4-Dichloro-1,2,5-thiadiazole?
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The CAS number is 5728-20-1, and the molecular formula is C2Cl2N2S.
What grade and purity does Tech Serve Solutions supply for 3,4-Dichloro-1,2,5-thiadiazole?
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Tech Serve Solutions supplies 3,4-Dichloro-1,2,5-thiadiazole with a minimum assay of 97%. We do not represent this product as USP, BP, EP, or any other pharmacopoeial grade.
How should 3,4-Dichloro-1,2,5-thiadiazole be handled safely?
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3,4-Dichloro-1,2,5-thiadiazole is classified as a Warning. It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Handle with appropriate personal protective equipment, including eyeshields, gloves, and a suitable respirator, in a well-ventilated area. Avoid breathing dust/fume/gas/mist/vapours/spray.
How is 3,4-Dichloro-1,2,5-thiadiazole packed, shipped, and exported?
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3,4-Dichloro-1,2,5-thiadiazole is carefully packed according to international shipping regulations. Tech Serve Solutions, as a specialist global supplier and exporter since 1998, can facilitate international shipments.
How can I request a sample or quote for 3,4-Dichloro-1,2,5-thiadiazole?
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To request a sample or a quote for 3,4-Dichloro-1,2,5-thiadiazole, please use the contact form on our website or call our sales department directly.
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