Chemistry:Methyl violet 6B
| Methyl violet 6B | |
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| IUPAC name
4-[[4-(dimethylamino)phenyl]-(4-methyliminocyclohexa-2,5-dien-1-ylidene)methyl]-N,N-dimethylaniline hydrochloride
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| Properties | |
| C24H28N3Cl | |
| Appearance | Green to dark-green powder[1] |
| Melting point | 137 °C (279 °F; 410 K) decomposes[1] |
| Soluble in water, ethanol, insoluble in xylene[1] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Methyl violet 6B (Pentamethylparosanilinium chloride, 4-[[4-(dimethylamino)phenyl]-(4-methyliminocyclohexa-2,5-dien-1-ylidene)methyl]-N,N-dimethylaniline hydrochloride) is a violet triarylmethane dye from the group of cationic dyes and an essential component of C.I. Basic Violet 1 (trivial name methyl violet). The compound is sometimes equated with methyl violet in the literature.
Methyl violets are mixtures of tetramethyl (2B), pentamethyl (6B) and hexamethyl (10B) pararosanilins.[2]
Synthesis
To produce methyl violet 6B, N,N-dimethylaniline is oxidized with atmospheric oxygen and copper sulfate as a catalyst, using phenol and large amounts of salt as a diluent. The central carbon atom of the dye is provided by the oxidation of a methyl group of N,N-dimethylaniline to formaldehyde.[3] In this process, a reaction product is obtained that contains the tetra- to hexamethylated compounds in addition to the pentamethylated compound.
References
- ↑ 1.0 1.1 1.2 Sabnis, R. W. (29 March 2010). Handbook of Biological Dyes and Stains: Synthesis and Industrial Applications. John Wiley and Sons. pp. 309–. ISBN 978-0-470-40753-0. https://books.google.com/books?id=M59Kw54ehwAC&pg=PA309. Retrieved 27 June 2011.
- ↑ Bouasla, C.; Samar, M. E. H.; Ismail, F. (2010). "Degradation of methyl violet 6B dye by the Fenton process". Desalination 254 (1–3): 35–41. doi:10.1016/j.desal.2009.12.017.
- ↑ K. Venkataraman (1952), The Chemistry of Synthetic Dyes, II, New York, London: Academic Press, pp. 719
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