http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3639473-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7b94d2715cda37c1f23e48f9f4f23422 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-3294 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-304 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-32 |
| filingDate | 1968-03-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1972-02-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4ccd5484e72bbce16c72044832b904cf |
| publicationDate | 1972-02-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-3639473-A |
| titleOfInvention | Acetic diphenylphosphinic anhydride and method of preparing same |
| abstract | ACETIC DIPHENYLPHOSPHINIC ANHYDRIDE IS PREPARED BY DISSOLVING DIPHENYPHOSPHINIC ACID IN A LARGE EXCESS OF ACETIC ANHYDRIDE UNDER HEATING TO FORM A SOLUTION AT A TEMPERTURE OF ABOUT 50 TO 60*C. THE MIXED ANHYDRIDE IS ISOLATED BY FLASH EVAPORATION OF THE EXCESS ACETIC ANHYDRIDE AND THE ACETIC ACID FROM THE REACTIO SOLUTION. HIGHER YIELDS OF THE MIXED ANHYDRIDE ARE OBTAINED WHEN A MIXTURE OF THE DIPHENYLPHOSPHINIC ACID AND A LARGE EXCESS OF ACETIC ANHYDRIDE ARE HEATED TO A REFLUX TEMPERATURE OF ABOUT 140*C. IN THE PRESENCE OF AN ADDED SMALL AMOUNT OF ACETIC ACID WHICH IS SUFFICIENT TO REPRESS DISPROPORTIONATION OF THE MIXED ANHYDRIDE AT TEMPERATURES OF ABOUT 100*C. AND HIGHER UP TO THE REFLUX TEMPERATURE. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4195035-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4196141-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4267125-A |
| priorityDate | 1968-03-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.