http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-653785-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_40824c489e71a02b85c9c7227fb75fb4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_82ade88182f3803d607ec330412dfaa5 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8d5f3119fabb478c5062d8513be52360 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-367 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C205-60 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C201-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-367 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C205-60 |
| filingDate | 1948-10-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1951-05-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-653785-A |
| titleOfInvention | Process for the manufacture of hydroxy acids |
| abstract | o-Hydroxybenzoic acids and their salts are prepared from an aqueous solution of an alkali metal salt of an o-halogenobenzoic acid of formula <FORM:0653785/IV (b)/1> where R is hydrogen, halogen or a nitro group, by heating in a closed vessel in the presence of an alkali metal carbonate and a source of copper, followed if desired by acidification of the reaction mixture with a mineral acid, e.g. to pH 3. The source of copper may be the metal, copper bronze, or a copper salt, or preferably a mixture of copper and cuprous iodide. When R is a nitro group the reaction temperature is 110-160 DEG C., e.g. 135-150 DEG C., and when R is halogen between 160 DEG and 190 DEG C. 2 - Chloro - and 2 - bromobenzoic acid, 2-bromo-4-nitrobenzoic acid, and 6-nitro-2-chlorobenzoic acids may be used in the process. Examples are given of the preparation of 3-, 4-, and 5-nitrosalicylic acids, and 3- and 4-chlorosalicylic acids. Specification 600,640 is referred to. |
| priorityDate | 1948-10-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 36.