| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_af99df08b153738cd418446a75d09bfc |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D241-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D319-22
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D265-33 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D265-32 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D265-33
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D241-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D319-22 |
| filingDate |
1977-12-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1978-12-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a7243804e965f04d612495e0fb6c4c41 |
| publicationDate |
1978-12-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4130711-A |
| titleOfInvention |
Process for production of piperazinediones |
| abstract |
N-substituted cyclic imides of diacids such as oxydiacetic acid and N-substituted iminodiacetic acid are produced by contacting a hydroxy amide of the formula n n HOCH.sub.2 CH.sub.2 --A--CH.sub.2 --CONHR n n with a reduced copper dehydrogenation catalyst at a temperature of about 200°-30 ° C, A representing --O-- or ##STR1## and R and R' being hydrocarbon groups of 1-8 carbon atoms. The reaction is preferably conducted in the presence of hydrogen and the diol corresponding to the hydroxyamide. The process is essentially a means of making oxydiacetic acid or iminodiacetic acid from diethylene glycol or diethanolamine respectively as the original starting material. These dicarboxylic acids are useful chelating agents, particularly for Ca and Mg ions, they are intermediates in chemical syntheses, and they are difunctional monomers for making polyester plastics. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4208522-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7847123-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110734384-B
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110734384-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1922926-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2008145320-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6229045-B1 |
| priorityDate |
1976-08-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |