http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-771855-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6b6fc801b5bfe5304ffa40d938db6e09 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D493-04 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D493-04 |
| filingDate | 1955-07-14^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-04-03^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-771855-A |
| titleOfInvention | Process for the production of new derivatives of 4-hydroxycoumarin |
| abstract | The invention comprises 4-hydroxycoumarin derivatives of the formula <FORM:0771855/IV(b)/1> wherein R represents an alkyl group containing 1 to 4 carbon atoms together with a process for their preparation by reacting a mixture of the corresponding 3-(a -nitrophenyl-b -acetyl-ethyl)-4-hydroxycoumarin and an alcohol ROH with a dehydrating agent, particularly anhydrous hydrogen chloride. In an example, 3-[a -(41-nitrophenyl) - b - acetyl - ethyl] - 4 - hydroxy - coumarin is refluxed in absolute methanol and dry hydrogen chloride passed into the solution where 2 - methyl - 2 - methoxy - 4 - (41 - nitro - phenyl) - 5 - oxo - dihydropyrano - [3,2 - c] - benzopyran separates and is crystallised from methyl ethyl ketone-methanol. The corresponding 31-nitrophenyl analogue is similarly prepared. Starting materials. 3 - [a - (21 - nitrophenyl) - b - acetyl - ethyl] - 4 - hydroxycoumarin and the 31- and 41-nitrophenyl analogues are prepared by the process described in Specification 701,111. |
| priorityDate | 1954-07-16^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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