http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-105272872-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3cce30a5cea77a562682658ca3617c1a |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C241-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C243-22 |
| filingDate | 2014-06-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a3060d9fa124ac4d3e4672c979048904 |
| publicationDate | 2016-01-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-105272872-A |
| titleOfInvention | 4-bromophenylhydrazine phosphate preparation method |
| abstract | The invention relates to a 4-bromophenylhydrazine phosphate preparation method. The method comprises the steps of diazotization, reduction, purification and salt formation. In the diazotization and reduction steps, a reaction liquid is kept strongly acidic with concentrated hydrochloric acid, such that smooth and complete reactions are ensured. In the reduction step, zinc powder-concentrated hydrochloric acid is adopted as a reducing agent for replacing sodium thiosulfate, sodium bisulfite, stannous chloride-hydrochloric acid and the like, such that reduction performance is good, yield is high, and reaction time is shortened. Impurities such as zinc hydroxide produced in the reaction are easy to remove, such that product impurity amount is low, and product purity is high. In the salt formation step, acetone is used for leaching, such that product purity is improved, and product appearance is ensured. The preparation method has the advantages of stable and reliable process, easy operation, and high product purity (product content is no lower than 99.2% as a result of high-performance liquid chromatography). A product yield is no lower than 42%. The method can completely satisfy market demands on 4-bromophenylhydrazine phosphate. |
| priorityDate | 2014-06-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 39.