http://rdf.ncbi.nlm.nih.gov/pubchem/patent/IE-54285-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_cae71083b119f18009470b1882e54e4d |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-80 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-80 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D- |
| filingDate | 1982-12-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1989-08-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | IE-54285-B1 |
| titleOfInvention | Purification of tetrahydrodibenzo (b,d) pyrans from crude synthetic mixtures |
| abstract | (-)-6a, 10a-Trans-1-hydroxy-3-n-pentyl-6,6,9-trimethyl-6a,7,8,10a-tetrahydrodibenzo[b,d]pyran or any of its related pyrans in which the n-pentyl group is replaced by hydrogen or C1-C10 alkyl is isolated from a crude synthetic mixture by a process which comprises esterifying the mixture to form perfluorinated alkanoic acid esters, removing low-boiling and non-volatile components, passing the mixture through a first gas chromatographic column with a packing whose liquid phase consists of a slightly polar phenyl-substituted silicone oil and recovering a fraction rich in the desired component, passing the recovered fraction through a second gas chromatographic column with a packing whose liquid phase consists of a non-phenyl-substituted silicone oil and recovering a fraction rich in the desired component, hydrolyzing the fraction recovered from the second stage, and recovering the desired product from the hydrolysis mixture. |
| priorityDate | 1981-12-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 66.