http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CH-672785-A5
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3e9445e5e3626f36e932c6451a928250 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C309-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C- http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C309-40 |
| filingDate | 1987-08-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_118d96191f5459b618bea88a8bd7f329 |
| publicationDate | 1989-12-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CH-672785-A5 |
| titleOfInvention | 4,4-di:nitro-stilbene 2,2-di:sulphonic acid or salt prodn. |
| abstract | In the prodn. of 4,4'-dinitrostilbene-2,2'-disulphonic acid and its salts of formula (I) where M = H, an alkali metal or ammonium cation; by oxidn. of 4-nitrotoluene-2-sulphonic acid or its salts (II), the novelty is that oxidn. is carried out in liquid, anhydrous NH3, its alkyl derivs. opt. in the presence of water and/or mixts. of these in the presence of strong bases. Oxidn. is pref. carried out in a mixt. of NH3 and water. The base consists of alkali(ne earth) hydroxide(s) and/or alcoholate(s) or strongly basic ion exchanger and is dissolved in a protic solvent, pref. a low mol. alcohol and/or water. Catalysts may also be used, pref. heavy metal salts, (hydr)oxides or organic cpds., phase transfer catalysts or crown ethers. It is pref. to use a mixt. of 1-10, esp. 3-6 pts. NH3 and/or alkyl deriv. and opt. water per pt. (II). If water is present, the amt. of NH3 or alkyl deriv. in the mixt. with water is 50-99, esp. 60-80%. Oxidn. is carried out with pure O2, O2+ inert gas or air at -33 to +50, pref. -15 to +30 deg.C.. |
| priorityDate | 1987-08-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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