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Specifications
| Appearance: | White crystal |
| Content: | 99.5% min |
| Melting point (micromelting point instrument): | 152℃ min |
| Free acid: | 100ppm max |
| Moisture: | 100ppm max |
| Na: | 5ppm max |
| Fe: | 5ppm max |
| Zn: | 5ppm max |
| Cu: | 5ppm max |
| Cr: | 5ppm max |
| Co: | 5ppm max |
| Ni: | 5ppm max |
Applications
1. SO₂ Equivalent in Organic Synthesis
Primary use: It serves as a bench-stable, solid source of sulfur dioxide (SO₂) in synthetic chemistry.
Offers a safer and more convenient alternative to gaseous SO₂, which is toxic and difficult to handle.
Reacts with nucleophiles (such as organolithiums or Grignard reagents) to generate sulfinates, sulfones, and sulfonamides.
2. Sulfonylation Reactions
Used to introduce sulfone and sulfonamide functional groups in pharmaceuticals, agrochemicals, and specialty materials.
Ideal in reactions involving sulfonyl radicals or intermediates for the construction of more complex molecules.
3. Radical Chemistry
Can participate in radical-based processes to generate sulfonyl-containing heterocycles or chains, often under mild photochemical or redox conditions.
Suitable for transition-metal-catalyzed cross-coupling involving SO₂ insertion (e.g., with aryl halides and amines).
4. Medicinal Chemistry and Drug Design
Sulfonyl-containing structures are common in active pharmaceutical ingredients (APIs), and this compound aids in their construction efficiently.
Used in the synthesis of bioactive sulfonylated heterocycles, sulfonamides, and sulfones, which are core motifs in antibiotics, antitumor agents, and enzyme inhibitors.
Benefits
✅ Stable and Easy to Handle
Unlike gaseous SO₂, this compound is a crystalline solid and easier to weigh, store, and use in lab-scale and industrial settings.
✅ High Reactivity with Organometallics
Efficiently reacts with nucleophiles like organolithiums and Grignards, enabling diverse synthetic transformations.
✅ Selective Sulfonylation
Enables high control in the insertion of SO₂, minimizing side products compared to traditional sulfonation methods.
✅ Applicable in Green Chemistry
Avoids the use of corrosive and volatile SO₂ gas.
Can be used under milder conditions with less hazardous waste.
Conclusion
1,5,2,4-Dioxadithiane 2,2,4,4-tetraoxide (CAS 99591-74-9) is a powerful and versatile reagent used primarily as a solid, bench-stable SO₂ surrogate in organic synthesis. It allows for safer, more efficient sulfonylation reactions without the need to handle toxic sulfur dioxide gas. This makes it particularly attractive in pharmaceutical and agrochemical industries for the synthesis of sulfone- and sulfonamide-containing molecules. Its applications in modern organic and radical chemistry continue to expand, offering synthetic chemists a valuable tool for building sulfur-containing compounds.
