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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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Diphenic acid (diphenyl-2,2’-dicarboxylic acid) [482-05-3] C14H10O4, M 242.2, m 228-229°, pK25 3.46. Crystallise diphenic acid from water. Hot Ac2O provides the anhydride below. The dimethyl ester m 74° and b 204-204°/14mm, crystallises from MeOH as colourless prismatic plates, and the diethyl ester m 74°, crystallises as colourless cubes from EtOH. [Beilstein 9 H 922, 9 IV 3552.] Diphenic anhydride (diphenyl-2,2’-dicarboxylic anhydride) [6050-13-1] C14H8O3, M 466.3, has m 217°, 222-224°, 225-227°. After removing free acid by extraction with cold aqueous Na2CO3, the residue is crystallised from acetic anhydride and dried at 100°. Acetic anhydride converts the acid to the anhydride. It also crystallises from *C6H6 (m 219°) or chlorobenzene ( ...

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