Disodium 4,4'-dinitrostilbene-2,2'-disulfonate
 | |
| Identifiers | |
|---|---|
| 3709-43-1 | |
| ECHA InfoCard | 100.020.956 |
| Properties | |
| C14H8N2Na2O10S2 | |
| Molar mass | 474.335 |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Disodium 4,4′-dinitrostilbene-2,2′-disulfonate is an organic compound with the formula (O2NC6H3(SO3Na)CH)2 This salt is a common precursor to a variety of textile dyes.
Preparation and reactions
In the laboratory disodium 4,4′-dinitrostilbene-2,2′-disulfonate is obtained by sulfonation of 4-nitrotoluene giving the intermediate product, which is further oxidized with sodium hypochlorite yielding 4,4′-dinitrostilbene-2,2′-disulfonic acid disodium salt.[1]
The compound is useful because it couples with aniline derivatives to give azo dyes. Commercially important dyes derived from this compound include Direct Red 76, Direct Brown 78, and Direct Orange 40.[2]
References
- ↑ "Synthesis of disodium 4,4′-dinitrostilbene-2,2′-disulfonate". www.PrepChem.com.
- ↑ Klaus Hunger, Peter Mischke, Wolfgang Rieper, Roderich Raue, Klaus Kunde, Aloys Engel "Azo Dyes" in Ullmann’s Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim.doi:10.1002/14356007.a03_245.
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