Title: p-Chlorobenzoic Acid
CAS Registry Number: 74-11-3
CAS Name: 4-Chlorobenzoic acid
Additional Names: chlorodracylic acid
Molecular Formula: C7H5ClO2
Molecular Weight: 156.57
Percent Composition: C 53.70%, H 3.22%, Cl 22.64%, O 20.44%
Literature References: Prepn by catalytic oxidation of 1-chloro-4-ethylbenzene: Emerson et al., J. Am. Chem. Soc. 71, 1742 (1949). Manuf by oxidation of p-chlorobenzaldehyde: Shipman, US 3124611 (1964 to ICI). Crystal structure: Toussaint, Acta Crystallogr. 4, 71 (1951), C.A. 45, 6604e (1951); Pollock, Woodward, ibid. 7, 605 (1954), C.A. 48, 13331e (1954).
Properties: Triclinic crystals, mp 243°. Sol in 5290 parts water; freely sol in alcohol, ether.
Melting point: mp 243°
Derivative Type: Methyl ester
Additional Names: Methyl p-chlorobenzoate
Molecular Formula: C8H7ClO2
Molecular Weight: 170.59
Percent Composition: C 56.33%, H 4.14%, Cl 20.78%, O 18.76%
Properties: mp 44°.
Melting point: mp 44°
Derivative Type: Sodium salt
Additional Names: Sodium p-chlorobenzoate
Molecular Formula: C7H4ClNaO2
Molecular Weight: 178.55
Percent Composition: C 47.09%, H 2.26%, Cl 19.86%, Na 12.88%, O 17.92%
Properties: White, odorless, crystalline powder, freely sol in water.
Use: Sodium salt as a preservative. |