| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5ddadb999be4f451dfc44d8e359d8f6a |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D249-20
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C245-08 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C245-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D249-20 |
| filingDate |
2001-07-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fa12eb9ffce8da115375f8ebef2f4358
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5a95c8f8ad041f95ff9ba23b6a4f4a9b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1071162a90296d3d07d91532fa69976c
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7835a0e225f4e5d046b310c3458a47e0
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fdd5bc99bb9363738e02df9d2af7db81
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e283032bd9a5f65ce53c837771868c61
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_287a91026ef08d36b4141dfb7b1c6861 |
| publicationDate |
2002-02-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CA-2416356-A1 |
| titleOfInvention |
Processes for the preparation of benzotriazole uv absorbers |
| abstract |
Provided is a process for preparing 2H-benzotriazole UV absorbers containing a perfluoroalkyl moiety at the 5-position of the benzo ring, for example a trifluoromethyl group, which involves diazotizing the perfluoroalkyl substituted o-nitroaniline using concentrated sulfuric acid plus sodium nitrite or nitrosylsulfuric acid to form the corresponding monoazobenzene intermediate via the diazonium salt intermediate which is reduced to the corresponding 5-perfluoroalkyl substituted 2H-benzotriazole UV absorber compound by conventional reduction means. Also provided is a novel one-pot, multiphase reaction for the preparation of 2(2-nitrophenylazo) substituted phenols, which are precursors for 2H-benzotriazole UV absorbers. |
| priorityDate |
2000-08-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |