4,4′-Diaminodiphenyl sulfide
4,4′-Diaminodiphenyl sulfide (CAS: 139-65-1), also known as 4,4′-Thiodianiline, is an organic sulfur compound with the linear formula S(C6H4NH2)2 and a molecular weight of 216.30 g/mol. This chemical serves as a valuable building block in organic synthesis, particularly in the creation of polymers and other complex organic molecules. Its structure, featuring two aniline groups linked by a sulfur atom, makes it useful in various chemical research and development applications.
- IUPAC
- 4,4′-Thiodianiline
- Synonyms
- S(C6H4NH2)24,4′-Thiodianiline

Polymer Synthesis
Utilised as a monomer or cross-linking agent in the synthesis of high-performance polymers, such as polyimides and polyamides, due to its diamine functionality and thermal stability.
Organic Synthesis Intermediate
Serves as a key intermediate in the multi-step synthesis of various organic compounds, including pharmaceuticals and specialty chemicals, leveraging its reactive amine groups.
Material Science Research
Employed in research settings for the development of novel materials with specific electronic or optical properties, owing to its conjugated structure and sulfur linkage.
| Molecular weight | 216.30 |
|---|---|
| Linear formula | S(C6H4NH2)2 |
| Assay | 98% |
| Melting point | 105-107 °C(lit.) |



Hazard statements
- H302Harmful if swallowed
- H350May cause cancer
- H411Toxic to aquatic life with long-lasting effects
Precautionary statements
- P201Obtain special instructions before use
- P273Avoid release to the environment
- P308IF exposed or concerned
| Protective equipment | Eyeshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T,N |
| Risk statements (R) | 45-22-51/53 |
| Safety statements (S) | 53-45-61 |
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 4,4′-Diaminodiphenyl sulfide used for?
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4,4′-Diaminodiphenyl sulfide is primarily used as a building block in organic synthesis, particularly for the creation of polymers like polyimides and polyamides, and as an intermediate in the synthesis of other complex organic molecules and specialty chemicals.
What is the CAS number and formula for 4,4′-Diaminodiphenyl sulfide?
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The CAS number for 4,4′-Diaminodiphenyl sulfide is 139-65-1, and its linear formula is S(C6H4NH2)2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4,4′-Diaminodiphenyl sulfide with an assay of 98%. This product is intended for chemical synthesis and research use and is not represented as USP, BP, or EP grade.
How should 4,4′-Diaminodiphenyl sulfide be handled safely?
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4,4′-Diaminodiphenyl sulfide is a hazardous substance. It is harmful if swallowed, suspected of causing cancer, and toxic to aquatic life with long lasting effects. Handle with appropriate personal protective equipment, including eyeshields, gloves, and respiratory protection (type N100 or P3 filters recommended). Ensure adequate ventilation and avoid release into the environment.
How is 4,4′-Diaminodiphenyl sulfide packed and shipped?
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4,4′-Diaminodiphenyl sulfide is packed according to industry standards for hazardous chemicals and is available for global export by Tech Serve Solutions, a specialist supplier.
How can I request a quote or sample for 4,4′-Diaminodiphenyl sulfide?
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To request a quote or sample of 4,4′-Diaminodiphenyl sulfide, please contact the Tech Serve Solutions sales team through our website or via the provided contact details.
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