p-Toluic acid

p-Toluic acid

Names
IUPAC name 4-Methylbenzoic acid
Other names para-toluic acid p-toluic acid para-methylbenzoic acid p-methylbenzoic acid toluene-4-carboxylic acid crithminic acid
Identifiers
CAS Number	99-94-5
ChEBI	CHEBI:36635
ChEMBL	ChEMBL21708
ChemSpider	7190
EC Number	202-803-3
Jmol 3D model	Interactive image
KEGG	C01454
InChI InChI=1S/C8H8O2/c1-6-2-4-7(5-3-6)8(9)10/h2-5H,1H3,(H,9,10) Key: LPNBBFKOUUSUDB-UHFFFAOYSA-N InChI=1/C8H8O2/c1-6-2-4-7(5-3-6)8(9)10/h2-5H,1H3,(H,9,10) Key: LPNBBFKOUUSUDB-UHFFFAOYAB
SMILES O=C(O)c1ccc(cc1)C
Properties
Chemical formula	C8H8O2
Molar mass	136.15 g·mol^−1
Appearance	Crystalline solid
Density	1.06g/mL
Melting point	180 to 181 °C (356 to 358 °F; 453 to 454 K)[1]
Boiling point	274 to 275 °C (525 to 527 °F; 547 to 548 K)[1]
Solubility in water	Sparingly soluble in hot water
Thermochemistry
Std enthalpy of formation (ΔfH^o298)	-429 kJ/mol
Std enthalpy of combustion (ΔcH^o298)	3862 kJ/mol
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

p-Toluic acid (4-methylbenzoic acid) is a substituted benzoic acid with the formula CH₃C₆H₄COOH. It is an intermediate in some industrial processes for the oxidation of p-xylene to terephthalic acid which is used in the manufacture of polyethylene terephthalate. It is a white crystalline solid that is practically insoluble in water, but soluble in acetone.

See also

• o-Toluic acid
• m-Toluic acid

References

1. Merck Index, 12th Edition, 9673