http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-19990062727-A
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C49-683 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C46-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C50-18 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C50-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-69 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C49-683 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C46-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J23-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C46-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C46-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C50-16 |
| filingDate | 1998-12-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1999-07-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | KR-19990062727-A |
| titleOfInvention | Process for preparing substituted anthraquinones |
| abstract | The present invention relates to the reaction of 1,4-naphthoquinone with 1,3-diene of formula (2) in a ring addition step, in which both the cycloaddition step and the oxidation step are carried out in the presence of an aqueous diluent, the corresponding tetrahydroanthra Quinate is produced and this tetrahydroanthraquinone is oxidized with oxygen in the presence of a base catalyst to produce anthraquinone of formula (1).n n n n n n n n n n n n n n n n n (Wherein R 1 , R 2 , R 3 and R 4 may be the same or different and are hydrogen, C 1 -C 8 -alkyl or C 2 -C 8 -alkenyl group)n n n Preferably, the ring addition step and the oxidation step are carried out at atmospheric pressure at a reaction temperature of 90 to 110 ° C. |
| priorityDate | 1997-12-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 69.