''p''-Toluic acid

p-Toluic acid

Names
Preferred 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 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:36635
ChemSpider	7190 Y
ECHA InfoCard	100.002.549
EC Number	202-803-3
KEGG	C01454 Y
InChI InChI=1S/C8H8O2/c1-6-2-4-7(5-3-6)8(9)10/h2-5H,1H3,(H,9,10) Y Key: LPNBBFKOUUSUDB-UHFFFAOYSA-N Y 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 (ΔfHo298)	-429 kJ/mol
Std enthalpy of combustion (ΔcHo298)	3862 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
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