Process for the preparation of para-benzoquinone
US4208339A · kind A · utility
12Cited by
3References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1978 |
| Grant date | Jun 17, 1980 |
| Priority date | — |
| Expiry date | Jun 23, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C46/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
p-Benzoquinone is prepared by oxidizing phenol with molecular oxygen or with a gas in which oxygen is present, in the liquid phase, in the presence of cuprous or cupric ions. The improvement resides in carrying out the reaction in the presence of a metal, in the metallic form, which is selected from the group consisting of nickel, iron, tin, cobalt, chromium, molybdenum, magnesium and copper. The resultant p-benzoquinone is useful as an industrial source of hydroquinone, which is employed in photography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.