http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1943534-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-1406 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C309-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C309-43 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-14 |
| filingDate | 1969-08-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e125a82ca80ba7c3507c6e8d5cd13c39 |
| publicationDate | 1971-03-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-1943534-A1 |
| titleOfInvention | Process for the preparation of hydroxynaphthalenesulfonic acids |
| abstract | Hydroxynaphthalene sulphonic acids used in axo-dyestuffs manufacture. (A) R' = POCl2, R2 = R3 =H, (B) R' = POCl2, R2 = SO3H, R3 = H, (C) R' = POCl2, R2 = R3 = SO3H, (D) R' = R3 = H, R2 = SO3H, (E) R' = H, R2 = R3 = SO3H. alpha- and beta-naphthol give (IA) and (IIA) respectively with POCl3. Sulphonation, pref. with H2SO4, ClSO3H or oleum at 0-130 degrees C, then gives (IB) and (IIB) respectively; or (IC) and (IIC) respectively if >2 moles, pref. 3.5 moles, of sulphonating agent are used. Hydrolysis yields (ID), (IE), (IID) and (IIE) respectively. These compounds are useful as coupling components for azo-dyestuffs. No by-products formed as in previous syntheses. |
| priorityDate | 1969-08-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 61.