http://rdf.ncbi.nlm.nih.gov/pubchem/patent/SK-412488-A3
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_315ae544538aaeac6d1f4eed6754e4bb |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C255-57 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C255-53 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B63-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B57-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B37-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N53-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C253-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C255-14 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C253-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-743 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C255-57 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C255-53 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C255-39 |
| filingDate | 1988-06-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b50c638d6552f5a2fe685a1fe1c17066 |
| publicationDate | 1998-04-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | SK-412488-A3 |
| titleOfInvention | Method for conversion of isomeric pyrethroids initial mixture |
| abstract | Crystallizable pyrethroid isomer or enantiomer pairs are converted to more pesticidally active isomers by contacting a hydrocarbon slurry of the starting isomers with a base and a catalyst, the catalyst being substantially soluble in the slurry and selected from a quaternary ammonium compound, a quaternary phosphonium compound and a crown ether, agitating the slurry while maintaining a temperature effective for conversion, and recovering the resulting isomers. The tendency to form benzoin ester by-product is reduced by including in the slurry a weak base, an aldehyde scavenger such as a metabisulfite, and/or a tetraalkyl(C1-C5)ammonium halide catalyst dissolved in an aprotic solvent such as an organic nitrile. The process typically is effective for enriching cypermethrin, cyfluthrin and (cyano)(3-phenoxyphenyl)methyl 3-(2,2-dibromoethenyl)-2,2-dimethylcyclopropanecarboxylate in the more active species. |
| priorityDate | 1987-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 136.