HuagongsheHuagongshe Chemistry Print Report · For research reference only
Sodium → H acid
Participants
| Role | Name | HCID | Charge |
|---|---|---|---|
| Reactant | Sodium | HCID 5360545 | — |
| Reactant | 4-Amino-3-[(2,5-disulfophenyl)diazenyl]-5-hydroxynaphthalene-2,7-disulfonic acid | HCID 136045528 | — |
| Solvent | Water | HCID 962 | — |
| Product | H acid | HCID 7009 | — |
| Product | 2-Amino-p-benzenedisulfonic acid | HCID 60988 | — |
Reaction Steps
The suspension of the diazonium betaine was run into a precooled solution of the sodium salt of 28 g of 1-amino-8-hydroxy-2-(2',5'-dihydroxysulfonylphenylazo)naphthalene-3,6-disulfonic acid (obtained by strongly acid coupling of diazotized aniline-2,5-disulfonic acid to 1-amino-8-hydroxynaphthalene-3,6-disulfonic acid) in 300 ml of water, and the pH was brought to 5 with 25% strength by weight aqueous sodium acetate solution. After stirring had been carried out for two hours at from 10° to 15° C., the resulting dye of the formula ##STR15## was precipitated by saturation with potassium chloride, filtered off under suction and reacted further as a water-moist filter residue.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|---|
| Patent number | US05629409 |
| Source dataset | uspto-grants-1997_05 |
| ORD ID | ord-8c4da1b9d0d64757b60a9a79af4b0bd5 |
| Source note | uspto-grants-1997_05 |