para-Cresidine

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para-Cresidine
Skeletal formula of para-cresidine
Ball-and-stick model of the para-cresidine molecule
Names
IUPAC name
2-Methoxy-5-methylaniline
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.004.018
KEGG
RTECS number BZ6720000
Properties
C8H11NO
Molar mass 137.179
Appearance White crystals
Melting point 51.5 °C (124.7 °F; 324.6 K)
Boiling point 235 °C (455 °F; 508 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

para-Cresidine is an organic compound with the formula CH3OC6H3(CH3)NH2. It is a white solid that is soluble in organic solvents. The compound features both amine and methoxy functional groups. It is used as an intermediate in preparation of dyes and pigments.

Synthesis and reactions[edit]

The compound is obtained in several steps from 4-chlorotoluene. Nitration gives mainly 3-nitro-4-chlorotoluene, which reacts with methoxide sources to give 4-methoxy-2-nitrotoluene. Reduction of this nitro compound affords the aniline.[1]

Sulfonation with oleum gives 4-amino-5-methoxy-2-methylbenzenesulfonic acid. This sulfonic acid is a precursor to allura red AC, a red food coloring.[1]

Allura Red AC is a popular food coloring agent made from para-cresidine.

References[edit]

  1. ^ a b P. F. Vogt, J. J. Gerulis, "Amines, Aromatic" in Ullmann’s Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a02_037

External links[edit]