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) |
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