http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5576449-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D319-06 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D319-06 |
| filingDate | 1994-09-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1996-11-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ca341c0b61e37ca429a8abf2ff1e0101 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cf128408c7ec2c0fbf80c8003b655beb http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e64e3aef586c6fcab1439296e81c0fde http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b804527a591746305cd8f6fc6740f0e8 |
| publicationDate | 1996-11-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-5576449-A |
| titleOfInvention | Preparation of 2-substituted but-2-ene-1,4-dial-4-acetals and novel hemiacetals of glyoxal monoacetals |
| abstract | The preparation of 2-substituted but-2-ene-1,4-dial-4-acetals of the formula I ##STR1## in which the substituents R 1 to R 4 stand for hydrogen or C 1 -C 6 aliphatic radicals, and R 2 and R 3 or R 1 and R 2 are in each case common members of an aliphatic 4-membered to 7-membered ring, which can contain a hetero atom, and R 5 denotes an alkyl, alkenyl, or alkynyl radical having from 1 to 12 C atoms, which can be substituted by cycloaliphatic, aromatic or heterocyclic radicals or by hydroxy, ether, thioether, acyl, alkylamino, carboxy, or carbalkoxy groups, an optionally substituted aryl radical or an alkoxy, alkylthio, or acyloxy group, wherein n a) glyoxal is caused to react with a 1,3-propanediol of the formula II ##STR2## in aqueous solution in the presence of an acid to form a monoacetal of the formula III ##STR3## is neutralized, and if necessary the components more readily volatile than the monoacetal III are distilled off, n b) the monoacetal III obtained is caused to react with an aldehyde R 5 CH 2 --CHO in the presence of from 0.01 to 10 mol %, based on glyoxal, of a catalyst mixture of a secondary amine and an acid to form an aldol of the formula IV ##STR4## the components which are more volatile than the aldol IV being distilled off if necessary, and n c) the aldol IV is dehydrated in the presence of a water-eliminating agent to form the product I, n and novel hemiacetals of glyoxal monoacetals. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6546352-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010099894-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2906807-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6537722-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2008043947-A1 |
| priorityDate | 1993-09-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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