http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4341719-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C309-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C309-50 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C309-47 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C303-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C303-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C301-00 |
| filingDate | 1981-02-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1982-07-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_18f8155bfab4803485ace6fcd0307ca1 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c97957dad9626ec12ff48eb2624e4a2e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ca29be10ca51f5bba26c2975da05be9f http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e713b399de6a38d818001ffe58acae97 |
| publicationDate | 1982-07-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-4341719-A |
| titleOfInvention | Process for the preparation of 1-amino-2-ethoxy-naphthalene-6-sulphonic acid |
| abstract | A process for the preparation of 1-amino-2-ethoxy-naphthalene-6-sulphonic acid from 2-hydroxy-naphthalene-6-sulphonic acid which comprises: n A. contacting 2-hydroxy-naphthalene-6-sulphonic acid with at least an equimolar amount of an alkali metal nitrite in aqueous solution or suspension in the presence of hydrochloric acid, solution or suspension having a pH in the range of 2 to 5 and being at a temperature of 0° to 20° C.; n B. reducing the reaction product of step A in an aqueous suspension by contacting the same with excess iron in the presence of at least an equivalent amount of iron-II ions, relative to the reaction product obtained according to step A, in the presence of a mineral acid at a temperature from 50° to 120° C., and treating the thus-obtained reaction mixture with aqueous alkali metal hydroxide in the presence of iron oxide; n C. contacting the product of step B with excess acetic anhydride in an aqueous solution or suspension at a pH in the range of 3 to 10 at a temperature from 0° to 100° C.; n D. contacting the product of step C with an ethylating agent in the presence of an acid binding agent in an aqueous-organic solvent or diluent in a pH range from 8 to 14 at a temperature from 20° to 150° C.; and n E. deacetylating the product of step D by contacting the same at reflux with an aqueous alkali metal hydroxide. |
| priorityDate | 1980-03-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 56.