http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-670998-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_315d611c240458b1308de8455144105a |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B23-0025 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B23-0091 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B23-01 |
| filingDate | 1949-09-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3d24cdf456027995e392c541efbfb667 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_be73e91473a9d27864190c6069b87394 |
| publicationDate | 1952-04-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-670998-A |
| titleOfInvention | Improvements in or relating to substituted methine dyestuffs and to photographic silver halide emulsions containing the same |
| abstract | Dyes of the general formula <FORM:0670998/IV (c)/1> wherein R1 is alkyl, R2 and R3 are alkyl o aralkyl, D is the residue of a 5- or 6-membered heterocyclic nucleus, and n is 0 or 1 are prepared by condensing a compound of the general formula <FORM:0670998/IV (c)/2> with an alkyl or aralkyl quaternary salt of a 5- or 6-membered heterocyclic nitrogen compound having a thioether group in a or g -position to the quaternary nitrogen atom. The condensation may be effected in the presence of a basic condensing agent. The quaternary salt may be formed in situ and the dye prepared by fusing together the compound of the second general formula, the heterocyclic nitrogen base containing a thioether group in a - or g -position to the heterocyclic nitrogen atom, and an alkyl or aralkyl ester. Ethyl 4 - (3 - methyl - 2 : 3 - dihydrobenzthiazolylidene - 2) - 3 - methoxy - 2 - cyano - 2-butenoate is prepared by fusing together ethyl 2 - cyano - 3 - methoxy - 2 - butenoate, methyl p - toluenesulphonate, and 2 - methylthiobenzthiazole, adding ethyl alcohol and triethylamine, and refluxing. Ethyl 4-(3-methyl-2 : 3 - dihydrobenzthiazolylidene - 2) - 3 - ethoxy-2 - cyano - 2 - butenoate, methyl 4 - (3 - methyl-2 : 3 - dihydrobenzthiazolylidene - 2) - 3 - methoxy-2 - cyano - 2 - butenoate, methyl 4 - (3 - methyl-2 : 3 - dihydrobenzthiazolylidene - 2) - 3 - ethoxy-2 - cyano - 2 - butenoate, ethyl - 4 - (3 - ethyl-2 : 3 - dihydrobenzthiazolylidene - 2) - 3 - ethoxy-2 - cyano - 2 - butenoate, methyl 4 - (3 - ethyl-2 : 3 - dihydrobenzthiazolylidene - 2) - 3 - methoxy-2 - cyano - 2 - butenoate, ethyl 4 - (1 - methyl-1 : 2 - dihydroquinolylidene - 2) - 3 - ethoxy - 2-cyano - 2 - butenoate, ethyl 4 - (1 - methyl - 1 : 2-dihydroquinolylidene - 2) - 3 - methoxy - 2 - cyano-2 - butenoate, methyl 4 - (1 - methyl - 1 : 2-dihydroquinolylidene - 2) - 3 - methoxy - 2 - cyano-2 - butenoate, methyl 4 - (1 - methyl - 1 : 2-dihydroquinolylidene - 2) - 3 - ethoxy - 2 - cyano-2 - butenoate, ethyl 4 - (3 - methyl - 2 : 3 - dihydro-4 : 5 - benzbenzthiaolylidene - 2) - 3 - ethoxy - 2-cyano - 3 - butenoate, ethyl 4 - (3 - methyl - 2 : 3-dihydro - 6 : 7 - benzbenzthiazolylidene - 2) - 3-ethoxy - 2 - cyano - 2 - butenoate, methyl - 4-(3 - methyl - 2 : 3 - dihydro - 6 : 7 - benzbenzthiazolylidene - 2) - 3 - methoxy - 2 - cyano - 2-butenoate, methyl 4 - (3 - methyl - 2 : 3 - dihydro-4 : 5 - benzbenzthiazolylidene - 2) - 3 - methoxy-2 - cyano - 2 - butenoate, ethyl 4 - (3 - methyl-5 : 6 - dimethoxy - 2 : 3 - dihydrobenzthiazolylidene - 2) - 3 - ethoxy - 2 - cyano - 2 - butenoate, methyl 4 - (3 - methyl - 5 : 6 - dimethoxy - 2 : 3-dihydrobenzthiazolylidene - 2) - 3 - methoxy - 2-cyano - 2 - butenoate, ethyl 4 - (3 : 6 - dimethyl-2 : 3 - dihydrobenzoxazolylidene - 2) - 3 - ethoxy-2 - cyano - 2 - butenoate, methyl 4 - (3 : 6 - dimethyl - 2 : 3 - dihydrobenzoxazolylidene - 2)- 3-methoxy - 2 - cyano - 2 - butenoate, ethyl 4-(3 : 5 : 6 - trimethyl - 2 : 3 - dihydrobenzoxazolylidene - 2) - 3 - ethoxy - 2 - cyano - 2 - butenoate, and methyl 4 - (3 : 5 : 6 - trimethyl - 2 : 3-dihydrobenzoxazolylidene - 2) - 3 - methoxy - 2-cyano-2-butenoate are similarly prepared. According to the Provisional Specification, the methyl group of the intermediate may be replaced by a higher alkyl group, and in this case the first methine group of the resulting dyes carries an alkyl substituent. |
| priorityDate | 1949-09-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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