http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0642505-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fab82a381f9d0ff8a604cb09e446c878 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D333-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D333-08 |
| filingDate | 1992-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_38b3102e12bbb04f52ef4b96bc697daa http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4f525b83b1a5794d71b4274eafc598a2 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5f7c5a7e404d187fef2af8503512c990 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_647dac4a03a2192b5a4f672df627d983 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f6bb1a9649c83eac370898d7866aec64 |
| publicationDate | 1995-03-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-0642505-A1 |
| titleOfInvention | Process for the preparation of 3-substituted thiophenes |
| abstract | The invention relates to a process for the preparation of 3-substituted thiophenes in which the substituent is a C4-C18-alkyl group. According to the invention, the preparation is carried out by allowing an alkali metal salt of a C4-C18-alkyl-succinic acid to react with a compound of sulfur and phosphorus, e.g. tetraphosphorus decasulfide, in an organic solvent at a temperature of 100-180 °C, the product obtained being 3-(C4-C18-alkyl)thiophene. The said reaction may be the last step in a process in which the initial material is maleic acid anhydride with which α-C4-C18-alkene is combined so that C4-C18-alkenylsuccinic acid anhydride is obtained, whereafter this is hydrogenated catalytically to produce C4-C18-alkylsuccinic acid anhydride. This is thereafter reacted with an alkali metal hydroxide so that an alkali salt of the C4-C18-alkylsuccinic acid is obtained, which salt is reacted with a compound of sulfur and phosphorus to produce 3-(C4-C18-alkyl)thiophene, which constitutes the final product. |
| priorityDate | 1991-12-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 102.