Diphenyl carbonate
Chemical compound
From Wikipedia, the free encyclopedia
Diphenyl carbonate is the organic compound with the formula (C6H5O)2CO. It is classified as an acyclic carbonate ester. It is a colorless solid. It is both a monomer in combination with bisphenol A in the production of polycarbonate polymers[2][3] and a product of the decomposition of polycarbonates.[4]
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| Names | |
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| Preferred IUPAC name
Diphenyl carbonate | |
| Other names
Phenyl carbonate, di- | |
| Identifiers | |
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3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.002.733 |
| KEGG | |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C13H10O3 | |
| Molar mass | 214.216 g/mol |
| Density | 1.1215 g/cm3 at 87 °C |
| Melting point | 80–81 °C (176–178 °F; 353–354 K) |
| Boiling point | 306 °C (583 °F; 579 K) |
| insoluble | |
| Solubility | soluble in ethanol, diethyl ether, carbon tetrachloride, acetic acid[1] |
| Hazards | |
| GHS labelling: | |
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| Warning | |
| H302, H410, H411 | |
| P264, P270, P273, P301+P312, P330, P391, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Production
World production capacity of diphenyl carbonate was 254,000 tonnes in 2002, and phosgenation of phenol is the most significant route.[5] Phosgenation of phenol can proceed under various conditions. The net reaction is as follows:
- 2 PhOH + COCl2 → PhOCO2Ph + 2 HCl
The use of phosgene can be avoided by the oxidative carbonylation of phenol with carbon monoxide:[2]
- 2 PhOH + CO + [O] → PhOCO2Ph + H2O
Dimethyl carbonate can also be transesterified with phenol:
- CH3OCO2CH3 + 2 PhOH → PhOCO2Ph + 2 MeOH
The kinetics and thermodynamics of this reaction are not favorable. For example, at higher temperatures, dimethyl carbonate undesirably methylates phenol to give anisole.[2] Despite this, diphenyl carbonate made from non-phosgene sources has become a widely used raw material for the synthesis of bisphenol-A-polycarbonate in a melt polycondensation process.[6]
Applications
Polycarbonates can be prepared by transesterifying diphenyl carbonate with bisphenol A. Phenol is a co-product. These polycarbonates may be recycled by reversing the process: transesterifying the polycarbonate with phenol to yield diphenyl carbonate and bisphenol A.[2]