http://rdf.ncbi.nlm.nih.gov/pubchem/patent/AR-070895-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D213-61 |
| filingDate | 2009-03-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ecee64f68a853298771650c567aa45f8 |
| publicationDate | 2010-05-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | AR-070895-A1 |
| titleOfInvention | PROCESS FOR THE ELABORATION OF 2,3-DICLOROPIRIDINE |
| abstract | Method for preparing 2,3-dichloropyridine in which 3-amino-2-chloropyridine is reacted with a nitrite salt in the presence of aqueous hydrochloric acid to form a diazonium salt; and the diazonium salt is then decomposed in the presence of sulfamic acid and a copper catalyst where at least about 50% of the copper is in the oxidation state of copper (lI). Claim 1: A method for preparing 2,3-dichloropyridine (1), characterized in that it comprises the steps of: (1) reacting 3-amino-2-chloropyridine (2) or a solution comprising 3-amino-2-chloropyridine (2) with hydrochloric acid to form a 3- amino-2-chloropyridine hydrochloric acid salt; (2) reacting the 3-amino-2-chloropyridine hydrochloric acid salt with a nitrite salt to form the corresponding diazonium chloride salt; and (3) reacting the corresponding diazonium chloride salt with hydrochloric acid in the presence of sulfamic acid and a copper catalyst, where at least about 50% of the copper is the oxidation state of copper (II), optionally in the presence of an organic solvent, to form 2,3-dichloropyridine (1). |
| priorityDate | 2008-03-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 22.