| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_05a203d85ee01909eaf728dc16f0f6cb |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-31
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-16 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-757
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C255-46
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C253-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C62-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-16
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C235-40
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C59-265
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-31 |
| filingDate |
1974-06-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate |
1975-10-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
GB-1409523-A |
| titleOfInvention |
Process for citric acid production and intermediate therefor |
| abstract |
1409523 1-Hydroxycyclopent-3-ene-1-carboxylic acid; its esters and amides; and their use in the preparation of citric acid PFIZER Inc 12 June 1974 [15 June 1973] 26157/74 Heading C2C The invention comprises compounds of Formula II in which R is a C 1-10 alkoxy group or a hydroxy or animo group which are prepared by reacting a nitrile of Formula I with water or an alkanol in the presence of an acid catalyst and a process for the preparation of citric acid which comprises treating a compound of Formula II with an oxidizing agent to cleave the double bond and form two carboxylic acid groups and, when R is alkoxy or amino, hydrolysing the resulting product. 1 - Hydroxy - 3 - cyclopentene - 1 - carbonitrile is prepared by reaction of 3-cyclopenten-1-one with liquid hydrogen cyanide. |
| priorityDate |
1973-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |