http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CZ-292668-B6
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c2b9dc89cc4ba060cc73bbf0c90bbb78 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-72 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-58 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-72 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-58 |
| filingDate | 1997-08-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7e816352cdac6a292ca5d57b6f509cad http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9bd4aa6f62a582dc9d5991d3d368edcd http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_217a15a739e576261f9f4f00fb36c2ad |
| publicationDate | 2003-11-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CZ-292668-B6 |
| titleOfInvention | Process for preparing 2H-1-benzopyran |
| abstract | The process for the preparation of the 2H-1-benzopyranes of the formula I is that in the first step the aliphatic aldehyde of the formula II is converted with an aliphatic alcohol of the formula R 4 with 4 OH or HOR with 4 OH where R .sup.4.n. is an alkyl group or (C.sub.1.n.-C.sub.4) alkanediyl group, in the presence of a dehydrating compound of formula HC (OR.sup.5.n.) Sub.3.n, where R.sup.5.n. is an alkyl group, and an alumina / silica catalyst, to an aliphatic acetal of formula III, wherein R 4 is 4. is an alkyl group, or both, R 4, R 4, R 4, R 4, R 4, R 4, R 4, R 4, R 4, R 4, R 4, R 6 or R 6. forming a cyclic (C.sub.2.times.sub.4) alkandiyl group, which is then condensed in a second step with a phenol of formula IV in the presence of a base in an inert organic solvent to give the final product of formula I. |
| priorityDate | 1996-08-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 61.