HuagongsheHuagongshe Chemistry Print Report · For research reference only
Hydrochloric Acid → 7-methoxy-1-oxo-1H-2-benzothiopyran-3-carboxylic acid
Participants
| Role | Name | HCID | Charge |
|---|---|---|---|
| Reactant | Hydrochloric Acid | HCID 313 | — |
| Reactant | Sodium Hydroxide | HCID 14798 | — |
| Reactant | 5-(2-Carboxy-4-methoxybenzylidene)rhodanine | HCID 53722834 | — |
| Product | 7-methoxy-1-oxo-1H-2-benzothiopyran-3-carboxylic acid | HCID 21440742 | — |
Reaction Steps
A solution of the benzylidenerhodanine of Example 7 in 18 ml. of 15% NaOH is refluxed for 0.75 hour and poured into dilute HCl, whereupon a yellow solid forms. The solid is collected and recrystallized from ethanol to give 7-methoxy-1-oxo-1H-2-benzothiopyran-3-carboxylic acid as pale yellow needles, m.p. 291°-292°.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|---|
| Patent number | US03960892 |
| Source dataset | uspto-grants-1976_06 |
| ORD ID | ord-d1a0b4f9bff84331bceb8e46ba109ef0 |
| Source note | uspto-grants-1976_06 |