http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-613016-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_daffb7a51b2f96580e71a5f15faf6592 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C37-002 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-00 |
| filingDate | 1947-04-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1948-11-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-613016-A |
| titleOfInvention | Improvements in or relating to the preparation of 2.2-dihydroxy-diphenylmethane |
| abstract | A copper chromate hydrogenation catalyst is prepared by adding cupric nitrate to a solution formed by the addition of ammonium hydroxide to aqueous ammonium dichromate, and the dried powdered precipitate is heated, suspended in aqueous acetic acid, filtered off, and dried.ALSO:Resinous condensation products of the resol or Novolak type are prepared by reacting 2 : 21-dihydroxy-diphenylmethane alone or in admixture with one or more of its isomers with a carbonyl compound, e.g. formaldehyde.ALSO:2 : 21-Dihydroxy - diphenylmethane is prepared by fusing xanthane with caustic alkali, e.g. in air at 200 DEG to 300 DEG C., and reducing the 2 : 21-dihydroxy-benzophenone which separates from the reaction mixture, e.g. by adding acid to the cooled fused mass. The caustic alkali may be used in excess, e.g. potassium hydroxide may be used in a quantity approximately three times the weight of xanthone employed. The reduction may be effected by the action of hydrogen, e.g. at 2000 lbs./sq. in. pressure and at a temperature of 175 DEG C., upon dry 2 : 21-dihydroxy-benzophenone melted with a copper chromite hydrogenation catalyst. In examples: (1) 2 : 21-dihydroxy-benzophenone is prepared by fusing xanthone and potassium hydroxide, and is then melted with a copper chromite catalyst and reacted with hydrogen to yield 2 : 21 - dihydroxy - diphenylmethane; (2) 2 : 21-dihydroxy-benzophenone prepared as in (1) is reduced by refluxing with zinc amalgam, toluene, alcohol and concentrated hydrochloric acid. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2925444-A |
| priorityDate | 1947-04-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 41.