Title: Benzilic Acid
CAS Registry Number: 76-93-7
CAS Name: a-Hydroxy-a-phenylbenzeneacetic acid
Additional Names: diphenylglycolic acid
Molecular Formula: C14H12O3
Molecular Weight: 228.24
Percent Composition: C 73.67%, H 5.30%, O 21.03%
Literature References: Prepd from benzil by the action of concd aq or alc KOH: Adams, Marvel, Org. Synth. vol. 1, p 29 (1921); Ballard, Dehn, ibid. coll. vol. I, 82; Kao, Ma, J. Chem. Soc. 1931, 443.
Properties: Monoclinic needles from water. Bitter taste. mp 150°. Melt is deep red at higher temp. pKa (25°): 3.036. Slightly sol in cold water; freely sol in hot water, alc, ether.
Melting point: mp 150°
pKa: pKa (25°): 3.036
Derivative Type: Potassium salt
Molecular Formula: C14H11O3K
Molecular Weight: 266.33
Percent Composition: C 63.14%, H 4.16%, O 18.02%, K 14.68%
Properties: Crystals, very sol in water, alc.
Derivative Type: Lead salt
Molecular Formula: (C14H11O3)2Pb
Molecular Weight: 661.67
Percent Composition: C 50.83%, H 3.35%, O 14.51%, Pb 31.31%
Properties: Amorphous precipitate. Upon heating it becomes a red liquid.
Derivative Type: Methyl ester
Molecular Formula: C15H14O3
Molecular Weight: 242.27
Percent Composition: C 74.36%, H 5.82%, O 19.81%
Properties: mp 74-75°. bp13 187°.
Melting point: mp 74-75°
Boiling point: bp13 187°
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