Phenylacetic Acid
Title: Phenylacetic Acid
CAS Registry Number: 103-82-2
CAS Name: Benzeneacetic acid
Additional Names: a-toluic acid
Molecular Formula: C8H8O2
Molecular Weight: 136.15
Percent Composition: C 70.57%, H 5.92%, O 23.50%
Line Formula: C6H5CH2COOH
Literature References: Made by refluxing benzyl cyanide with dil H2SO4 or HCl: Adams, Thal, Org. Synth. 2, 63 (1922). Absorption spectrum: Baly, Tryhorn, J. Chem. Soc. 107, 1065 (1915).
Properties: Leaflets on distillation in vacuo; plates, tablets from petr ether; mp 76.5°. bp760 265.5°; bp100 198.2°; bp40 173.6°; bp5 127°; bp1.0 97°. d477 1.091. pK (25°): 4.25. Slightly sol in cold, freely in hot water. The aq soln satd at 25° is 0.131N. Sol in alcohol, ether. Soly at 25° in chloroform (moles/l): 4.422; in carbon tetrachloride: 1.842; in acetylene tetrachloride: 4.513; in trichlorethylene: 3.299; in tetrachlorethylene: 1.558; in pentachloroethane: 3.252.
Melting point: mp 76.5°
Boiling point: bp760 265.5°; bp100 198.2°; bp40 173.6°; bp5 127°; bp1.0 97°
pKa: pK (25°): 4.25
Density: d477 1.091
 
Derivative Type: Methyl ester
Molecular Formula: C9H10O2
Molecular Weight: 150.17
Percent Composition: C 71.98%, H 6.71%, O 21.31%
Properties: Liquid, bp 215°.
Boiling point: bp 215°
 
Derivative Type: Ethyl ester see Ethyl phenylacetate
 
Use: Starting material in manuf synthetic perfumes, condensation products with aldehydes.

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