GB822720A - Production of xanthene derivatives - Google Patents
Production of xanthene derivativesInfo
- Publication number
- GB822720A GB822720A GB950456A GB950456A GB822720A GB 822720 A GB822720 A GB 822720A GB 950456 A GB950456 A GB 950456A GB 950456 A GB950456 A GB 950456A GB 822720 A GB822720 A GB 822720A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- xanthyl
- formula
- heating
- xanthylidene
- 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
- C07D311/78—Ring systems having three or more relevant rings
- C07D311/80—Dibenzopyrans; Hydrogenated dibenzopyrans
- C07D311/82—Xanthenes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention comprises xanthyl-9-glycollic acid, xanthylidene-9-acetic acid and the preparation of xanthyl-9-glycollic acids of the formula <FORM:0822720/IV (a)/1> and/or xanthylidene-9-acetic acids of the formula <FORM:0822720/IV (a)/2> where R is hydrogen, a halogen atom having an atomic number of at least 17 or a C1-6 alkyl or alkoxy group, which comprises heating an aqueous solution of a xanthyl alpha-halogenoacetic acid of the formula <FORM:0822720/IV (a)/3> at a pH above 2 and, when necessary, acidifying the product. By suitable adjustment of the pH during heating, one or other of the products may be obtained exclusively. 9-Methylenexanthene is obtained as a by-product. Xanthylbromoacetic acid is obtained by reacting xanthydrol with bromomalonic acid to give xanthylbromomalonic acid which is then monodecarboxylated by heating in an aromatic hydrocarbon solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB950456A GB822720A (en) | 1956-03-27 | 1956-03-27 | Production of xanthene derivatives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB950456A GB822720A (en) | 1956-03-27 | 1956-03-27 | Production of xanthene derivatives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB822720A true GB822720A (en) | 1959-10-28 |
Family
ID=9873237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB950456A Expired GB822720A (en) | 1956-03-27 | 1956-03-27 | Production of xanthene derivatives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB822720A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1241438B (en) * | 1963-05-02 | 1967-06-01 | Emil Frese Dipl Chem | Process for the production of beta, beta-disubstituted acrylic acid esters and the corresponding acrylic acid |
-
1956
- 1956-03-27 GB GB950456A patent/GB822720A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1241438B (en) * | 1963-05-02 | 1967-06-01 | Emil Frese Dipl Chem | Process for the production of beta, beta-disubstituted acrylic acid esters and the corresponding acrylic acid |
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