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P-Toluic acid

p-toluic acid para-methylbenzoic acid p-methylbenzoic acid toluene-4-carboxylic acid crithminic acid

p-Toluic acid (4-methylbenzoic acid) is a substituted benzoic acid with the formula CH3C6H4CO2H. It is a white solid that is poorly soluble in water but soluble in acetone. A laboratory route to p-toluic acid involves oxidation of p-cymene with nitric acid.

Role in production of terephthalic acid

p-Toluic acid is an intermediate in the conversion of p-xylene to terephthalic acid, a commodity chemical used in the manufacture of polyethylene terephthalate. It is generated both by the oxidation of p-xylene as well as the hydrogenolysis of 4-carboxybenzaldehyde. In related processes it is converted to methyl p-toluate, which is oxidized to monomethyl terephthalate.

References

''[[Merck Index]]'', 12th Edition, '''9673'''
W. F. Tuley. (1947). "p-Toluic Acid". Org. Synth..
(2013). "p-Xylene Oxidation to Terephthalic Acid: A Literature Review Oriented toward Process Optimization and Development". Chemical Reviews.

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benzoic-acids

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