http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-728758-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_73ee0bacab5a7576a6a3244747f6ea99 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C233-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C233-12 |
| filingDate | 1952-07-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c0bbf003129909c7af699f2fd93c35df http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6aa5b15aece67e6072095a61e545dff7 |
| publicationDate | 1955-04-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-728758-A |
| titleOfInvention | Improved process for the manufacture of a dyestuff intermediate |
| abstract | 2 - Hydroxy - 3 - naphthoic - 21 - naphthylamide is p prepared by heating 2-naphthylamine-1-sulphonic acid (Tobias acid) or a salt thereof with 2-hydroxy-3-naphthoic acid or a salt thereof and phosphorus trichloride in an inert liquid medium, and in the presence of disodium hydrogen phosphate. Both the hydroxy-naphthoic and Tobias acids may be used in the form of their alkali-metal salts, these being preformed or formed in situ before addition of the phosphorus trichloride. The disodium hydrogen phosphate may also be formed in situ in the reaction mixture. The inert liquid should preferably be an organic liquid boiling above 100 DEG C. (e.g. xylene) and the reaction is preferably carried out at the boiling point of this liquid. In an example the sodium salt of 2-hydroxy-3-naphthoic acid (prepared in situ) is heated under reflux with Tobias acid, phosphorus trichloride and disodium hydrogen phosphate in a xylene solvent to form 2-hydroxy-3-naphthoic-21-naphthylamide which is isolated from the reaction mixture by cooling, treatment with sodium carbonate solution and steam distillation, the solid obtained by filtration being washed successively with water, dilute acid and water. According to the Provisional Specification alkali or alkaline salts including trisodium phosphate, sodium carbonate and caustic soda may be used instead of the disodium hydrogen phosphate. Specification 700,024 is referred to. |
| priorityDate | 1952-07-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.