GB990486A - A process for the preparation of halogenated aromatic compounds - Google Patents
A process for the preparation of halogenated aromatic compoundsInfo
- Publication number
- GB990486A GB990486A GB4078462A GB4078462A GB990486A GB 990486 A GB990486 A GB 990486A GB 4078462 A GB4078462 A GB 4078462A GB 4078462 A GB4078462 A GB 4078462A GB 990486 A GB990486 A GB 990486A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- temperature
- medium
- preparation
- formic acid
- 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
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The process for the preparation of a compound of a general formula <FORM:0990486/C2/1> wherein X represents a halogen atom, which comprises hydrolysing 3,5-dihalo-4-methylbenzenesulphonyl chloride or bromide with formic acid, preferably a 95% by weight aqueous solution and at 50 DEG -150 DEG C. and desulphonating the resulting sulphonic acid by treatment with a medium promoting the ionisation of the sulphonic acid at a temperature of at least 180 DEG C., preferably by passing an aqueous solution of the sulphonic acid into a stable non-volatile acid medium e.g. 75-85% sulphuric acid at a temperature of at least 180 DEG C. Superheated steam preferably at 230-250 DEG C. is blown through the acid medium and the desired product collected from the condensed vapour. In an example 3,5-dichloro-4-methyl-benzenesulphonyl chloride is refluxed with 95% formic acid, excess formic acid being distilled off and the residue dissolved in water which is passed into 80% sulphuric acid through which superheated steam is blown at a temperature of 230 DEG to 150 DEG C. The volatile products on condensation gave 2,6-dichlorotuluene.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL299812D NL299812A (en) | 1962-10-29 | ||
| GB4078462A GB990486A (en) | 1962-10-29 | 1962-10-29 | A process for the preparation of halogenated aromatic compounds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4078462A GB990486A (en) | 1962-10-29 | 1962-10-29 | A process for the preparation of halogenated aromatic compounds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB990486A true GB990486A (en) | 1965-04-28 |
Family
ID=10416591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4078462A Expired GB990486A (en) | 1962-10-29 | 1962-10-29 | A process for the preparation of halogenated aromatic compounds |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB990486A (en) |
| NL (1) | NL299812A (en) |
-
0
- NL NL299812D patent/NL299812A/xx unknown
-
1962
- 1962-10-29 GB GB4078462A patent/GB990486A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL299812A (en) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB478303A (en) | Improvements in the manufacture of ketene, acetic anhydride or a homologue thereof | |
| GB990486A (en) | A process for the preparation of halogenated aromatic compounds | |
| GB1011581A (en) | Process for recovering isophorone and acetone from the autocondensation products of acetone | |
| FR2440352A1 (en) | PROCESS FOR THE PREPARATION OF A DERIVATIVE OF PHENOXYCARBOXYLIC ACID BY REACTION OF A PHENOL COMPOUND AND A HALOGEN COMPOUND | |
| GB945578A (en) | Mono adducts of dialdehydes | |
| Trippett et al. | 601. The reaction of triphenylphosphine with 1-bromo-l-nitroalkanes | |
| GB543944A (en) | Improvements in or relating to the manufacture of hypochlorous acid | |
| Cornforth et al. | 218. Mechanism and extension of the Fischer oxazole synthesis | |
| FI814202L (en) | FOERFARANDE FOER FRAMSTAELLNING AV 2-HYDROXI-3-CHLORPROPYL-TRIMETHYLAMMONIUM CHLORIDE | |
| GB709377A (en) | Process for treating wool | |
| GB1130513A (en) | Production of trioxane | |
| GB762625A (en) | Improvements in the production of piperazine | |
| FR2279726A1 (en) | PROCESS FOR THE EXTRACTION OF GUANIDINE CARBONATE FROM DILUTED AQUEOUS SOLUTIONS | |
| US2933533A (en) | Substituted resorcinol and process of preparing | |
| US2166233A (en) | Process of preparing antlneubmc | |
| GB316900A (en) | Process for the manufacture of condensation products from aldehydes and phenols | |
| GB1013897A (en) | Hydrates of fluoro-ketones and their preparation | |
| GB347892A (en) | Manufacture of aromatic condensation products | |
| GB347052A (en) | Manufacture of perfumes | |
| Waters et al. | 41. The reactions of acridine and 5-phenylacridine with benzyl radicals | |
| GB854999A (en) | A process for the production of itaconic anhydride | |
| GB939905A (en) | A process for preparing a penillic acid and salts thereof | |
| GB730472A (en) | Improvements in or relating to the production of 2:4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidine | |
| GB361597A (en) | Improvements in the manufacture and production of dimethylol acetone and its homologues | |
| GB793098A (en) | Manufacture of polymers of aminoacetic acid |