http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5817838-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f0653b87e774630cb1da426c77931a1f |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D317-72 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D317-36 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J31-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D317-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D317-72 |
| filingDate | 1997-10-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1998-10-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_46b6082fa3f8901f3417b7c1454a7b7b http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cba599c24baea5e8655500e6de39e56e |
| publicationDate | 1998-10-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-5817838-A |
| titleOfInvention | Process for manufacturing cyclocarbonates using a silver salt catalyst |
| abstract | A process for the manufacture of 4,4-disubstituted 5-methylene-1,3-dioxolan-2-ones ("cyclocarbonates") of the formula: <IMAGE> I wherein R1 and R2 each independently signify a saturated or olefinically-unsaturated aliphatic group or an aromatic group, or R1 and R2 together form tetra- or pentamethylene, by reacting a corresponding 3,3-disubstituted prop-1-yn-3-ol of the formula HC 3BOND C-C(R1)(R2)-OH (II) with carbon dioxide in the presence of a quaternary ammonium or phosphonium salt as the catalyst comprises using a silver salt as a further catalyst. An alkali metal or quaternary ammonium or phosphonium salt of a carboxylic acid can also be used to increase the catalytic performance of the silver salt catalyst. Moreover, the addition of triphenylphosphine serves to accelerate the reaction to some extent. The silver salts catalyze this process significantly better than the previously utilized copper salts. Advantageously, the process uses much smaller amounts of catalyst, significantly shortens reaction times, and mandates less drastic reaction conditions. Cyclocarbonates produced by this process are valuable intermediates for the production of polymerizates and other useful substances, such as dyestuffs and carotenoids. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1090916-A1 |
| priorityDate | 1996-10-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 221.