http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H01305044-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_95585944cd76ddfb6dc33ed2a0b84403 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-84 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C27-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C39-16 |
| filingDate | 1988-06-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_494851c6df3dbf110d91cfa7aea04ba9 |
| publicationDate | 1989-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H01305044-A |
| titleOfInvention | Purification of 4,4'-dihydroxytetraphenylmethanes |
| abstract | PURPOSE: To obtain the subject compound in the form of acicular crystal having high purity, in high solvent efficiency by using an aliphatic cyclic ether as a recrystallization solvent, dissolving 4,4'-dihydroxytetraphenylmethanes in the solvent and purifying the compound by recrystallization. n CONSTITUTION: Crude crystal of 4,4'-dihydroxytetraphenylmethanes is preferably washed with a proper solvent (e.g., ethanol) beforehand, dissolved in an aliphatic cyclic ether preferably under heating and purified by cooling and recrystallizing at a cooling rate of 100-0.01°C/min to obtain the objective compound useful as a raw material for polymers such as polycarbonate and an intermediate for organic compounds. The aliphatic cyclic ether is preferably a 5-membered or 6-membered aliphatic cyclic ether such as tetrahydrofuran or 1,4-dioxan and its amount is usually 1-1,000g (2-500g for forming large acicular crystals) based on 1g of the 4,4'-dihydroxytetraphenylmethanes. n COPYRIGHT: (C)1989,JPO&Japio |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2008290983-A |
| priorityDate | 1988-06-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 22.