Diphenyl carbonate → Oxalic acid, diphenyl ester
Reaction equation
[C:1](=[O:16])([O:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)OC1C=CC=CC=1>Cl.[Cl-].C1([P+](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.O>[C:1]([O:9][C:10]1[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=1)(=[O:16])[C:1]([O:9][C:10]1[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=1)=[O:16]Participants
Reactant 1
Product 1
Reagents, catalysts & solvents 3
Procedure
400 parts of distilled water were added to 200 parts of diphenyl carbonate, obtained through the decarbonylation reaction of diphenyl oxalate using a hydrochloride of tetraphenyl phosphonium chloride as a catalyst, and the mixture was heated to 90° C. and stirred for 1 hour. This washing step was repeated twice to obtain diphenyl carbonate containing 4.9 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 3.0×10−5 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 I-A and I-B below.
Sources & evidence
- ORD record
- ord-2f23847414bd4b9c8fe8acee9e9242c3
- Source dataset
- uspto-grants-2001_07
- Patent number
- US06265524B1
Reaction notes
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