GB752761A - Process for making alpha, alpha-dihalopropionic acids - Google Patents
Process for making alpha, alpha-dihalopropionic acidsInfo
- Publication number
- GB752761A GB752761A GB25161/54A GB2516154A GB752761A GB 752761 A GB752761 A GB 752761A GB 25161/54 A GB25161/54 A GB 25161/54A GB 2516154 A GB2516154 A GB 2516154A GB 752761 A GB752761 A GB 752761A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alpha
- acid
- catalyst
- propionic acid
- chlorine
- 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
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
- C07C51/363—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by introduction of halogen; by substitution of halogen atoms by other halogen atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
Alpha, alpha - dihalopropionic acids are obtained by (1) reacting propionic acid with an equimolecular proportion of chlorine or bromine at a temperature of 50-140 DEG C. in the presence of a catalyst consisting of phosphorus or its halide, oxyhalide, oxygen acid or oxide, to obtain an alpha-halopropionic acid; and (2) reacting this alpha-acid with an equimolecular proportion of chlorine or bromine at a temperature of 150-225 DEG C. in the presence of the same catalyst. Alternatively the alpha-halo propionic acid may be prepared in the first stage as described in U.S.A. Specification 2,010,685. According to this Specification, anhydrous propionic acid containing some acyl halide, such as a propionyl halide, is reacted with the theoretically required quantity of chlorine at 50-140 DEG C. in the presence of a catalyst consisting of halides, oxyhalides, oxygen acids or oxides of phosphorus, arsenic, antimony, sulphur, selenium or tellurium. Alpha, alpha-dichloro-propionic acid, alpha, alpha-dibromo-propionic acid, or alpha-chloro-alpha-bromopropionic acid may be so prepared. Phosphorus trichloride is the preferred catalyst. The a ,a -acid may be produced by feeding halogen into a mixture of the halo-acid and catalyst at the rate at which it reacts, more catalyst being added during the course of the reaction if required. Sufficient water may be added to the product to hydrolyse the small quantity of acyl chloride and anhydride also formed, the product then being distilled.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US752761XA | 1953-10-15 | 1953-10-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB752761A true GB752761A (en) | 1956-07-11 |
Family
ID=22124646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25161/54A Expired GB752761A (en) | 1953-10-15 | 1954-08-30 | Process for making alpha, alpha-dihalopropionic acids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB752761A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1100014B (en) * | 1956-10-05 | 1961-02-23 | Dow Chemical Co | Process for the production of ª ‡, ª ‡ -dichloroisovaleric acid or salts thereof serving as herbicide and plant growth regulator |
-
1954
- 1954-08-30 GB GB25161/54A patent/GB752761A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1100014B (en) * | 1956-10-05 | 1961-02-23 | Dow Chemical Co | Process for the production of ª ‡, ª ‡ -dichloroisovaleric acid or salts thereof serving as herbicide and plant growth regulator |
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