| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_33d985a15fbf78d4c930939dd08e88cb |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D249-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D231-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D233-56 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D521-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D231-12 |
| filingDate |
1998-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2007-04-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b58986fe5abb78d315eda4509ee5ea52
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8d7b25d36d79b64f72dde261fafe2206
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4092f2c5ac9a3ac0bb15a96431c2a5ce
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cb2764f5372a608c41975103480188ae
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_282352fb2c579a05f6e63d7c03d621a9
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_84e74b94df910aee39be697d3ef31faf |
| publicationDate |
2007-04-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
DE-19832146-B4 |
| titleOfInvention |
Process for the preparation of 3-methylpyrazole or its salts |
| abstract |
Process for the preparation of 3-methylpyrazole or its salts by reaction of the sodium enolate of acetylacetaldehyde with a mineral acid salt of hydrazine, characterized in that a) the sodium enolate of acetylacetaldehyde is intermediately produced by reacting acetone and a formic acid alkyl ester in the presence of an alcoholate and of polyethylene glycol in an aprotic solvent at temperatures of -10 to + 40 ° C, b) then reacting the reaction mixture formed in step a) with the mineral acid salt of hydrazine in the presence of water at temperatures between 0 and 100 ° C and c) the 3-methylpyrazole formed, if appropriate after the reaction with an acid to form the 3-methylpyrazole salt, separated by customary methods. |
| priorityDate |
1998-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |