Hydroxydiphenyl acetic acid

Benzilic acid

Names
IUPAC name Hydroxy(diphenyl)acetic acid
Other names α,α-Diphenyl-α-hydroxyacetic acid, α,α-Diphenylglycolic acid, α-Hydroxydiphenyl acetic acid, 2,2-Diphenyl-2-hydroxyacetic acid, 2-Hydroxy-2,2-diphenylacetic acid, Diphenyl glycolic acid, Hydroxydiphenyl acetic acid
Identifiers
CAS Number	76-93-7 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:39414 Y
ChEMBL	ChEMBL578171 Y
ChemSpider	6220 Y
ECHA InfoCard	100.000.904
PubChem CID	6463
InChI InChI=1S/C14H12O3/c15-13(16)14(17,11-7-3-1-4-8-11)12-9-5-2-6-10-12/h1-10,17H,(H,15,16) Y Key: UKXSKSHDVLQNKG-UHFFFAOYSA-N Y InChI=1/C14H12O3/c15-13(16)14(17,11-7-3-1-4-8-11)12-9-5-2-6-10-12/h1-10,17H,(H,15,16) Key: UKXSKSHDVLQNKG-UHFFFAOYAV
SMILES O=C(O)C(O)(c1ccccc1)c2ccccc2
Properties
Chemical formula	C14H12O3
Molar mass	228.25 g·mol−1
Appearance	white solid
Density	1.08 g/cm3
Melting point	150 to 152 °C (302 to 306 °F; 423 to 425 K)
Boiling point	180 °C (356 °F; 453 K) (17.3 hPa)
Solubility in water	2 g/l (20 °C)
Hazards
R-phrases (outdated)	R22
S-phrases (outdated)	S23, S24, S25, S28, S36, S37, S45
NFPA 704	1 2 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Benzilic acid is an organic compound with formula C
₁₄H
₁₂O
₃ or (C
₆H
₅)₂(HO)C(COOH). It is a white crystalline aromatic acid, soluble in many primary alcohols.

Benzilic acid can be prepared by heating mixture of benzil, ethanol and potassium hydroxide.

Another preparation, performed by Liebig in 1838, is the dimerization of benzaldehyde, to benzil, which is transformed to the product by the benzilic acid rearrangement reaction.

Benzilic acid is used in the manufacture of glycollate pharmaceuticals including Clidinium, Dilantin, and Flutropium, which are antagonists of the muscarinic acetylcholine receptors.