http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4943637-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e2e66b5309f6e6ea12409be1b4a93604 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D249-20 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D249-20 |
| filingDate | 1988-08-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1990-07-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1a8fae2ddd9f3315f5fc47993307b164 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d4efd1447b50bd817721b1c3881a3cce |
| publicationDate | 1990-07-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-4943637-A |
| titleOfInvention | Method for preparing 2-phenylbenzotriazoles |
| abstract | This invention relates to a method for preparing a 2-phenylbenzotriazole of formula I, ##STR1## (wherein R 1 represents hydrogen or chlorine atom, a lower alkyl group having a carbon number of 1 to 4, a lower alkoxy group having a carbon number of 1 to 4, carboxyl group, or sulfonic acid group; R 2 represents hydrogen or chlorine atom, a lower alkyl group having a carbon number of 1 to 4, or a lower alkoxy group having a carbon number of 1 to 4; R 3 represents hydrogen or chlorine atom, an alkyl group having a carbon number of 1 to 12, a lower alkoxyl group having a carbon number of 1 to 4, phenyl group, a phenyl group substituted with an alkyl group having a carbon number of 1 to 8, phenoxy group, or a phenylalkyl group, the alkyl part of which has a carbon number of 1 to 4; R 4 represents hydrogen or chlorine atom, hydroxyl group, or a lower alkoxy group having a carbon number of 1 to 4; and R 5 represents hydrogen atom, an alkyl group having a carbon number of 1 to 12, or a phenylalkyl group, the alkyl part of which has a carbon number of 1 to 4), which comprises reducing an o-nitroazobenzene of formula III, ##STR2## (wherein R 1 , R 2 , R 3 , R 4 and R 5 are as defined above) with at least one selected from the group consisting of primary and secondary alcohol reducing agents in the presence of an aromatic ketone catalyst and base. n This invention further relates to a method for preparing a 2-phenylbenzotriazole of formula I as defined above, which comprises reducing 1 mole 2-phenylbenzotriazole-N-oxide of formula II, ##STR3## (wherein R 1 , R 2 , R 3 , R 4 and R 5 are as defined above) with 0.4 to 0.7 mole primary alcohol and/or 0.8 to 1.4 mole secondary alcohol in the presence of an aromatic ketone catalyst and base. n This invention still further relates to a method for preparing a 2-phenylbenzotriazole-N-oxide of formula II as defined above, which comprises reducing 1 mole o-nitroazobenzene of formula III as defined above with 0.4 to 0.7 mole primary alcohol and/or 0.8 to 1.4 mole secondary alcohol in the presence of an aromatic ketone catalyst and base. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7377998-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6284895-B1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5683861-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5104992-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5362881-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5292890-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5242834-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5756781-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6344505-B1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5739348-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5438142-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2003141027-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5466819-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5373037-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5187289-A |
| priorityDate | 1986-09-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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