GB749742A - Substituted alpha-chloroacetophenones - Google Patents
Substituted alpha-chloroacetophenonesInfo
- Publication number
- GB749742A GB749742A GB23370/51A GB2337051A GB749742A GB 749742 A GB749742 A GB 749742A GB 23370/51 A GB23370/51 A GB 23370/51A GB 2337051 A GB2337051 A GB 2337051A GB 749742 A GB749742 A GB 749742A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- diketochromane
- give
- chloro
- dichloro
- 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
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/58—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring other than with oxygen or sulphur atoms in position 2 or 4
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyrane Compounds (AREA)
Abstract
The invention comprises substituted o-hydroxychloroacetophenone of the general formula <FORM:0749742/IV(a)/1> where R is an alkyl or phenyl group or a halogen atom or is the radical <FORM:0749742/IV(a)/2> and R1 is hydrogen or a hydroxyl OH group. The compounds are made by splitting a chlorinated diketochromane of the formula <FORM:0749742/IV(a)/3> where R2 is an alkyl or phenyl group or a halogen atom or a 3-chloro-3-diketochromanylmethyl radical, by treating it with water followed by elimination of carbon dioxide. In examples (1) 3:3-dichloro-2:4-diketochromane is treated with water to give 2-hydroxy-omega-dichloracetophenone; (2) 3-chloro-3-ethyl-2:4-diketochromane is refluxed with water to give 2 - hydroxy - alpha - chlorobutyrophenone; (3) 3 - chloro - 3 - phenyl - 2:4 - diketochromane is refluxed with water to give 2-hydroxy-alpha-chloro - alpha phenyl - acetophenone; (4) 3:3-methylene - bis - (3 - chloro - 2:4 - diketo chromane) is refluxed with water to give 1:3-disalicoyl - 1:3 - dichloropropane; (5) 3:3 - dichloro - 7 - hydroxy - 2:4 - diketochromane, obtained by treating 4:7-dihydroxy coumarin with sulphuryl chloride is boiled with water to give omega-dichloro-2:4-dihydroxy-acetophenone acid (6) 4-hydroxycoumarin is converted to 3:3 - dichloro - 2:4 - diketochromane by treatment with sulphuryl chloride or with chlorine in carbon tetrachloride and the product is treated with water to give the product of (1). Specification 710,128 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS749742X | 1950-10-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB749742A true GB749742A (en) | 1956-05-30 |
Family
ID=5455337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23370/51A Expired GB749742A (en) | 1950-10-06 | 1951-10-08 | Substituted alpha-chloroacetophenones |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB749742A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3193448A (en) * | 1963-07-01 | 1965-07-06 | Buckman Labor Inc | Control of slime in aqueous liquids with a monosubstituted 2-bromoacetophenone |
-
1951
- 1951-10-08 GB GB23370/51A patent/GB749742A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3193448A (en) * | 1963-07-01 | 1965-07-06 | Buckman Labor Inc | Control of slime in aqueous liquids with a monosubstituted 2-bromoacetophenone |
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