http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0882035-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c2b9dc89cc4ba060cc73bbf0c90bbb78 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b09f893b262cefd50c5e76c4b85d1c0a |
| 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_8137475e39026e98a76d7c6c88f41c84 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8d6b68426bde2b37083ca2bc20e6e7a3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c6ba1f54c3960e2225476ff008fd99fb |
| publicationDate | 1998-12-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-0882035-A1 |
| titleOfInvention | Process for the production of 2h-1-benzopyrans |
| abstract | A process for the production of 2H-1-benzopyrans with general formula (I) where R1 is hydrogen, a (C¿1?-C4) alkyl group, R?2¿ is hydrogen, a (C¿1?-C6) alkyl group and R?3¿ is hydrogen, a (C¿1?-C4) alkyl group, a (C1-C4) haloalkyl group, a (C2-C4) alkenyl group, a (C1-C4) alkoxycarbonyl group, a (C1-C4) alkoxymethyl group, a (C1-C4) alkanoyl group, a (C1-C4) alkoxy group, a (C1-C4) alkylsulphonyl group, halogen, amino, alkylamino, dialkylamino, nitril, nitro or hydroxy, is characterised in that in a first stage an aliphatic aldehyde with general formula (II) where R?1 and R2¿ have the above-mentioned meaning, is converted with an aliphatic alcohol with the formula R4OH or HOR4OH, where R4 is a (C¿1?-C4) alkyl group or a (C2-C4) alkyldiyl group, in the presence of a dehydrating compound with the formula HC(OR?5)¿3, where R5 is a (C¿1?-C4) alkyl group, and an aluminium oxide/silicium oxide catalyst into an aliphatic acetal with general formula (III) where R?1 and R2¿ have the above-mentioned meaning and R4 as stated above is a (C¿1?-C4) alkyl group or the two R?4¿ together are a cyclical (C¿2?-C4) alkyldiyl group, and this is then condensed in a second stage with a phenol with general formula (IV) where R?3¿ has the above-mentioned meaning, in the presence of a base in an inert organic solvent, to the end product with general 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: 108.