| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6ccee8e1d48352b3e8c8af081eb34375 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-3847
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-657181
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-3826 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-38
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-6571 |
| filingDate |
1998-12-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2007-08-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c58e0473137bca98784cec136263fe8b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9a36c4418515c0040f403ddb41cb0f14
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a500b80ca502d00a1b59ee828e6e41fb
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2d1f2dce184d4f81c17a1b914f1c2c38
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_87b69bccdca62cbb0ce03c43433ef24f |
| publicationDate |
2007-08-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CA-2317479-C |
| titleOfInvention |
Preparation of phosphonic acid derivatives |
| abstract |
The method provides for the preparation of alkene phosphonic acids and salts thereof, such as VDPA (vinylidene diphosphonic acid). The products can be produced in a stable, substantially pure form and in hig h yield. The method includes the azeotropic removal of water from salts of .alpha.-hydroxy-alkane disphosphonic acid dimer or correspondi ng acids thereof, and the pyrolysis of the dehydrated reactant at a temperature of from 170 .degree.C to 300 .degree.C. There may be included a step to convert anhydrides which have been formed during the pyrolysis. The method may include the use of heat transfer agents and/or bases, and may be carried out at elevated or reduced pressure. |
| priorityDate |
1998-01-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |