GB695807A - Improvements in and relating to the production of dihydroxy-aromatic compounds - Google Patents
Improvements in and relating to the production of dihydroxy-aromatic compoundsInfo
- Publication number
- GB695807A GB695807A GB2063550A GB2063550A GB695807A GB 695807 A GB695807 A GB 695807A GB 2063550 A GB2063550 A GB 2063550A GB 2063550 A GB2063550 A GB 2063550A GB 695807 A GB695807 A GB 695807A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mols
- production
- aromatic compounds
- lined
- atmospheres
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
- C07C37/01—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by replacing functional groups bound to a six-membered aromatic ring by hydroxy groups, e.g. by hydrolysis
- C07C37/02—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by replacing functional groups bound to a six-membered aromatic ring by hydroxy groups, e.g. by hydrolysis by substitution of halogen
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
o-Dihydroxy aromatic compounds are made by treating the corresponding o-dihalogeno compounds (not fluoro) in the presence of water and absence of oxygen, in a vessel made of or surfaced or lined with copper, with at least 2 mols. of barium hydroxide or with at least 1 mol. of a soluble barium salt and sufficient alkali metal hydroxide to unite with all the acid radicals present; the reaction takes place at 200-250 DEG C. at a pressure of at least 50 atmospheres gauge, preferably 100 atmospheres. A copper catalyst such as cuprous oxide may also be present, e.g. up to 1 per cent by weight of the halogen compound. Preferably 2.5-3 mols. of barium hydroxide are used and the initial alkali strength is 2.0-3.5 N. The reactants are kept in the liquid phase by applying an initial pressure of nitrogen. The product is isolated by acidification with an aqueous mineral acid, extraction with an organic solvent (e.g. ether) and removal of the latter by distillation. Examples are given of the production of catechol from o-dichlorobenzene. Specification 425,230 is referred to. According to the Provisional Specification an enamel-lined vessel may be used for the reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2063550A GB695807A (en) | 1950-08-21 | 1950-08-21 | Improvements in and relating to the production of dihydroxy-aromatic compounds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2063550A GB695807A (en) | 1950-08-21 | 1950-08-21 | Improvements in and relating to the production of dihydroxy-aromatic compounds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB695807A true GB695807A (en) | 1953-08-19 |
Family
ID=10149181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2063550A Expired GB695807A (en) | 1950-08-21 | 1950-08-21 | Improvements in and relating to the production of dihydroxy-aromatic compounds |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB695807A (en) |
-
1950
- 1950-08-21 GB GB2063550A patent/GB695807A/en not_active Expired
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