http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-399491-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7b04f5b6a02051c94d6eaf190b751ed2 |
| filingDate | 1932-04-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1933-10-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-399491-A |
| titleOfInvention | Improvements in the manufacture and production of vat dyestuffs |
| abstract | Halogenanthraquinone-2,1-benzacridones are prepared by condensing 1,3-dihalogenanthraquinone-2-carboxylic acids or 1-nitro-3-halogen-anthraquinone-2-carboxylic acids or derivatives substituted in the carboxy group (esters, amides) with anilines having a free o-position and containing at least two halogen atoms at least one of which is in the 3- or 5-position, and ring-closing the products to form acridones. Or such products may also be obtained by brominating 3-halogenanthraquinone-2,1-benzacridones which may already contain halogen in the Bz-ring in the presence or not of catalysts. The products have the general formula:-- <FORM:0399491/IV/1> wherein x represents halogen and at least two positions marked y and z are substituted by halogen, at least one being in a position marked y, and are distinguished by an increased tinctorial power as vat-dyes compared with other anthraquinone benzacridones. In examples 1,3-dichloranthraquinone-2-carboxylic acid benzylester is condensed with (1) 2,3,4,5-tetrachloraniline, (2) m-dichloraniline, (3) 3,4,5-trichloraniline and (4) 2,4,5-trichloraniline, and the resulting products ring-closed by heating in nitrobenzene in presence of acetic anhydride and concentrated sulphuric acid to give chloracridones dyeing orange to red shades. The acridone from (2) above is further brominated in nitrobenzene in presence of iodine to give a trichlorodibromo derivative dyeing fast red shades. Reference is also made to the production of dyes containing bromine or iodine besides or instead of chlorine. Specifications 13907/09 and 894/11, [both in Class 2 (iii), Dyes &c.], are referred to. |
| priorityDate | 1932-04-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 41.