http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-769749-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_19aaaa9f91b7bf94ef9bdd9425970c0c |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-83 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-83 |
| filingDate | 1955-04-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-03-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-769749-A |
| titleOfInvention | Improvements in or relating to the manufacture of coloured photographic layers |
| abstract | 4 : 41 - Dimethoxy - diphenyl - pyridinemethane is prepared by adding a mixture of acetic acid and conc. sulphuric acid to a cooled mixture of pyridine-4-aldehyde and anisole. The product is heated in acetic acid with PbO2 to give 4 : 41 - dimethoxy - diphenyl - pyridinecarbinol. The leuco base and carbinol are similarly prepared using benzothiazole-2-aldehyde and benzselenazole-2-aldehyde. 10 - Methyl - phenothiazine - 5 - dioxide is prepared by refluxing 10-methyl-phenothiazine with H2O2 in acetic acid.ALSO:The preparations of certain dyes which fall within the following formula are described:- <FORM:0769749/IV(b)/1> wherein A is a nitrogen and/or sulphurcontaining heterocyclic nucleus, B and B1 are alkoxy or substituted amino groups or B1 may be hydrogen, R and R1 are hydrogen or R1 is carboxy and X is an anion such as chloride. Those wherein A is the residue of a phenothiazine, N-acetylphenothiazine, N-methyl-phenothiazine, N-methyl-phenothiazine-5-dioxide and carbazole nucleus, are prepared by reacting the heterocyclic compound (AH) with the appropriately substituted benzophenone, such as p-dimethylamino-o1-carboxy-; p-p1-dimethoxy-; 4-methoxy-; p-dimethylamino- and 4-dimethylamino-41-methoxy-benzophenones in the presence of POCL3 or PCl5 + P2O5. Those wherein A is te residue of a pyridine or phenothiazine nucleus and B and B1 are the same are prepared by melting the 4:41-dimethoxy-diphenyl-pyridine-(or phenothiazine)-carbinol with benzoic acid and adding 2-chloro-5-aminobenzoic acid, or mono-ethanolamine, or p-aminophenol, or p-amino-salicylic acid wherein the amino group reacts with both the methoxy groups of the carbinol. The dyes wherein A is benzthiazole or benzselenazole and B and B1 are methoxy (R and R1=H) are prepared by reacting the heterocyclic 2-aldehyde, with anisol in acetic acid and sulphuric acid, oxidizing the leuco-base with PbO2 and treating the carbinol formed with HCl. Thiophene-malachite green (A=thiophene) is referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0611807-A1 |
| priorityDate | 1954-04-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 60.