http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-654494-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_28a660c95866e78384d66dc23f57146f |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2527-054 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2-867 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C2-86 |
| filingDate | 1948-08-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1951-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-654494-A |
| titleOfInvention | Process for the preparation of ditolylethane |
| abstract | A process for preparing 1 : 1-di-p-tolylethane comprises adding paraldehyde to a mixture of toluene and sulphuric acid of about 87 to 95 per cent strength (i.e. comprising by weight acid and water in the ratio between 87 : 13 and 93 : 7 while maintaining the temperature below 10 DEG C. and agitating the resultant mixture, the amount of toluene being more than about 25 per cent in excess of that stoichiometrically required by the paraldehyde, and the amount of sulphuric acid being such that its strength is not reduced below about 87 per cent by the water formed during the reaction. Up to 50 per cent of the total toluene may be employed as diluent for the paraldehyde added to the mixture. The best yields are obtained by conducting the reaction of 0 DEG C., using 90 per cent sulphuric acid, and preferably an excess of 35 to 50 per cent toluene is employed. In an example, 86 parts of toluene and 100 parts of paraldehyde are added to a mixture of 520 parts of toluene and 890 parts of 90 per cent sulphuric acid kept at 0 DEG C. The product is distilled at reduced pressure from the separated hydrocarbon layer. The Specification also mentions fortifying the strength of the acid by adding oleum in the course of the reaction and refers also to the use of monomeric acetaldehyde in place of the paraldehyde, but these alternatives are said to lead to undesirable results. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3002034-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4612758-A |
| priorityDate | 1947-09-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 25.