http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-349361-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7b04f5b6a02051c94d6eaf190b751ed2 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B7-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H02K27-06 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H02K27-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B7-08 |
| filingDate | 1930-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1931-05-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-349361-A |
| titleOfInvention | Manufacture of vat-dyestuffs |
| abstract | A compound of the general formula: <PICT:0349361/IV/1> wherein the nucleus R may contain one or more substituents, is condensed with an isatin-a -derivative to give fast greenish-blue to green dyestuffs. The a -anthrone compounds of the above general formula are obtained by treating the reduction products of acylated-1.4-dihydroxyanthraquinones (prepared according to Specification 340,639) with an alcohol in the presence of a mineral acid. In examples: (1) 1-hydroxy-4-acetoxy-10-anthrone (prepared by reducing diacetylquinizarin in an acetic acid suspension with sodium hydrosulphite) is converted to the monomethylether of 1.4-dihydroxyanthrone by boiling with methanol and hydrochloric acid, and this ether is condensed with isatin-a -anilide; the corresponding monoethylether may be prepared by using ethylinstead of methyl alcohol and may similarly be condensed with isatin-a -anilide or with 5-chlorisatin-a -p-chloranilide: (2) 5-8-dichloro-1-hydroxy-4-acetoxy-10-anthrone (prepared by reducing diacetyl-5-8-dichlorquinizarin) is converted to a monomethyletherdichloro derivative by boiling with methanol and hydrochloric acid, and this derivative is condensed with isatin-a -anilide. It is also stated that the reduction products of 1-acetoxy- and 1.8-diacetoxyanthraquinone cannot be thus condensed with an isatin-a -derivative. |
| priorityDate | 1929-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.