GB729625A - Improvements in or relating to the preparation of non-odorous 2-methyl-4-chlorophenoxyacetic acid and its application as a selective weed-killer - Google Patents
Improvements in or relating to the preparation of non-odorous 2-methyl-4-chlorophenoxyacetic acid and its application as a selective weed-killerInfo
- Publication number
- GB729625A GB729625A GB14360/53A GB1436053A GB729625A GB 729625 A GB729625 A GB 729625A GB 14360/53 A GB14360/53 A GB 14360/53A GB 1436053 A GB1436053 A GB 1436053A GB 729625 A GB729625 A GB 729625A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cresol
- alkali
- methyl
- hypochlorite
- odorous
- 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
-
- 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
- C07C51/367—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by introduction of functional groups containing oxygen only in singly bound form
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
2-Methyl-4-chlorophenoxyacetic acid is prepared by reacting o-cresol with an alkali metal chloracetate in alkaline solution and treating the reaction liquid at pH above 8 (with or without recovering unchanged o-cresol) with a hypochlorite. This latter step results in an odourless product. The hypochlorite (preferably sodium) may be added as a separate solution or may be formed by passing chlorine into the alkaline reaction liquid, with further addition of alkali to maintain the pH above 8. The product may if desired be separated by acidification and may be converted into salts and esters. Examples are given of the process with and without steam distillation to remove the bulk of the unchanged o-cresol. Specifications 592,827 and 683,131 are referred to.ALSO:Non-odorous solutions of alkali 2-methyl-4-chlorophenoxyacetates (containing also inorganic salts) are obtained by reacting o-cresol with an alkali chloracetate in alkaline solution and treating the reaction liquid at pH above 8 (with or without recovering unchanged o-cresol) with a hypochlorite or chlorine and alkali. The latter treatment decomposes residual o-cresol without forming chlorocresols and the product is odourless and does not cause turbidity in hard water. Examples are given of the process.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL729625X | 1952-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB729625A true GB729625A (en) | 1955-05-11 |
Family
ID=19817922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14360/53A Expired GB729625A (en) | 1952-05-29 | 1953-05-21 | Improvements in or relating to the preparation of non-odorous 2-methyl-4-chlorophenoxyacetic acid and its application as a selective weed-killer |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB729625A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL442918A1 (en) * | 2022-11-23 | 2024-03-11 | Politechnika Poznańska | Method of isolating n-bromoalkyl 4-chloro-2-methylphenoxyacetates from the post-reaction mixture using flash chromatography |
-
1953
- 1953-05-21 GB GB14360/53A patent/GB729625A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL442918A1 (en) * | 2022-11-23 | 2024-03-11 | Politechnika Poznańska | Method of isolating n-bromoalkyl 4-chloro-2-methylphenoxyacetates from the post-reaction mixture using flash chromatography |
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