GB665419A - Process for the manufacture of derivatives of 3:3-methylene-bis-(4-oxycoumarin) - Google Patents
Process for the manufacture of derivatives of 3:3-methylene-bis-(4-oxycoumarin)Info
- Publication number
- GB665419A GB665419A GB26470/49A GB2647049A GB665419A GB 665419 A GB665419 A GB 665419A GB 26470/49 A GB26470/49 A GB 26470/49A GB 2647049 A GB2647049 A GB 2647049A GB 665419 A GB665419 A GB 665419A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxycoumarin
- bis
- aqueous solution
- methylene
- derivatives
- 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
- C07D311/42—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4
- C07D311/44—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4 with one hydrogen atom in position 3
- C07D311/46—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4 with one hydrogen atom in position 3 unsubstituted in the carbocyclic ring
- C07D311/48—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4 with one hydrogen atom in position 3 unsubstituted in the carbocyclic ring with two such benzopyran radicals linked together by a carbon chain
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
3 : 31 - Carbalkoxymethylene - bis - (4 - oxycoumarins) are manufactured by condensing 4-oxycoumarin with a bisulphite compound of an alkyl ester of glyoxylic acid, advantageously with an aqueous solution thereof obtained by oxidizing a dialkyl tartrate and extracting the reaction mixture with an aqueous solution of a bisulphite. In an example, diethyl tartrate is oxidized with lead tetra-acetate in benzene, the solution is filtered and extracted with a saturated aqueous solution of sodium metabisulphite, and the aqueous layer is separated and run into a boiling aqueous solution of 4-oxycoumarin, from which, on standing, 3 : 31-carbethoxymethylene-bis-(4-oxycoumarin) separates.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL665419X | 1949-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB665419A true GB665419A (en) | 1952-01-23 |
Family
ID=19798730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26470/49A Expired GB665419A (en) | 1949-03-29 | 1949-10-14 | Process for the manufacture of derivatives of 3:3-methylene-bis-(4-oxycoumarin) |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB665419A (en) |
| NL (1) | NL145672C (en) |
-
0
- NL NL145672D patent/NL145672C/xx active
-
1949
- 1949-10-14 GB GB26470/49A patent/GB665419A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL145672C (en) |
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