In organic chemistry, a biphenol refers to compounds with the formula (C6H4OH)2. Such compounds formally result from the coupling of two phenols. All are colorless solids with the formula (C6H4OH)2. Three symmetrical isomers of biphenol exist:
| Name | Registry number | PubChem | Melting point (°C) |
|---|---|---|---|
| 2,2'-Biphenol | 1806-29-7 | 109 | |
| 3,3'-Biphenol | 612-76-0 | 124.8 | |
| 4,4'-Biphenol | 92-88-6 | 283 |
Additionally, three unsymmetrical isomers of biphenols exist
| Name | Registry number | PubChem | Melting point (°C) |
|---|---|---|---|
| 2,3'-Biphenol | 31835-45-7 | ||
| 2,4'-Biphenol | 611-62-1 | 162–163 | |
| 3,4'-Biphenol | 18855-13-5 | 190 |
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