GB620608A - Improvements in or relating to purified weakly acidic organic chemicals and method of purifying same - Google Patents
Improvements in or relating to purified weakly acidic organic chemicals and method of purifying sameInfo
- Publication number
- GB620608A GB620608A GB28782/46A GB2878246A GB620608A GB 620608 A GB620608 A GB 620608A GB 28782/46 A GB28782/46 A GB 28782/46A GB 2878246 A GB2878246 A GB 2878246A GB 620608 A GB620608 A GB 620608A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sulphanilamido
- acid
- earth metal
- alkaline
- weakly acidic
- 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
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
- C07D239/56—One oxygen atom and one sulfur atom
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyridine Compounds (AREA)
Abstract
Weakly acidic organic chemical having pKa values (logarithm of the reciprocal of their dissociation constants) of 2-12, and capable of forming water-soluble alkaline-earth metal salts, are treated to remove coloured impurities by dissolving in aqueous alkaline solution, adding a compound capable of furnishing free alkaline-earth metal ions, adding a water-soluble alkali dithionite, and heating and agitating the mixture, whereby the impurities are reduced and an alkaline-earth metal sulphite is precipitated. Examples are given of the treatment of: (1) 2-sulphanilamido-4-methylpyridimine; (2) 2-(N4-acetylsulphanilamido-4-methylpyrimidine; (3) and (4) 2-sulphanilamidopyrimidine; (5) 2-thio-4-hydroxypyrimidine; (6) 2-sulphanilamidopyrazine; (7) 2-sulphanilamidothiazole; (8) 2-sulphanilamido-4,6-dimethylpyrimidine; and (9) 5-chloro-2-metanilamidopyrimidine. Other compounds which may be treated are o- and p-aminophenols, sulphanilic acid, metanilic acid, orthanilic acid, tyrosine, various aminonaphthalene sulphonic acids, p-aminobenzoic acid, N1-2-hydroxyethylsulphanilamide, sulphapyridine, N1 - acetylsulphanilamide, 2 - sulphanilamido - 1, 3, 4-thiadiazole, disulphanilamide, and sulphanilamide.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US620608XA | 1945-11-01 | 1945-11-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB620608A true GB620608A (en) | 1949-03-28 |
Family
ID=22039959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28782/46A Expired GB620608A (en) | 1945-11-01 | 1946-09-26 | Improvements in or relating to purified weakly acidic organic chemicals and method of purifying same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB620608A (en) |
-
1946
- 1946-09-26 GB GB28782/46A patent/GB620608A/en not_active Expired
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