Diphenyl carbonate → Oxalic acid, diphenyl ester
Reaction equation
[C:1](=[O:4])([O-:3])O.[Na+].[C:6](=O)([O:14]C1C=CC=CC=1)[O:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1>>[C:6]([O:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)(=[O:14])[C:1]([O:3][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)=[O:4]Participants
Procedure
400 parts of an aqueous solution of sodium hydrogencarbonate having a pH of 8 were added to 200 parts of diphenyl carbonate, obtained through the decarbonylation reaction of diphenyl oxalate using tetraphenylphosphonium chloride as a catalyst, the mixture was heated to 90° C. and stirred for 1 hour. This washing step was repeated twice. To the obtained heavy solution (diphenyl carbonate layer) was further added 400 parts of distilled water, and the resulting mixture was heated to 90° C. and stirred for 1 hour. This additional washing step was repeated twice. The resulting heavy solution was purified by distillation in the same manner as in Example 3 at an yield of 85% to obtain diphenyl carbonate containing 0.09 ppm of hydrolyzable chlorine. An ester interchange reaction between this diphenyl carbonate and bisphenol A was carried out in the same manner as in Example 1 except that a disodium salt of bisphenol A was used in place of sodium hydroxide as an ester interchange catalyst in an amount of 2.0×10−6 mole, in terms of sodium, based on bisphenol A, to synthesize polycarbonate. A pellet of this polycarbonate was used for the measurement of its physical properties. The conditions and results are shown in Tables III-A and III-B below.
Sources & evidence
- ORD record
- ord-b92460e91a5647bd97e99dd79deb946b
- Source dataset
- uspto-grants-2001_07
- Patent number
- US06265524B1
Reaction notes
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