Hydrochloric Acid → HCID 21440743、化合物
反応式
[C:1]([C:4]1[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][C:5]=1[CH:6]=[C:7]1[S:11]C(=S)N[C:8]1=[O:13])([OH:3])=O.Cl.[OH-:21].[Na+]>>[CH3:19][O:18][C:15]1[CH:16]=[CH:17][C:4]2[C:1](=[O:3])[S:11][C:7]([C:8]([OH:21])=[O:13])=[CH:6][C:5]=2[CH:14]=1参加物
4
実験手順
A solution of the 5-(2-carboxy-5-methoxybenzylidene)-rhodanine of Example 4 in dilute sodium hydroxide (35 ml. of 20% NaOH + 11 ml. H2O) is refluxed for one hour and then poured into dilute HCl. The resulting pale yellow solid is collected and recrystallized repeatedly from ethanol to give 6-methoxy-1-oxo-1H-2-benzothiopyran-3-carboxylic acid as pale yellow crystals, m.p. 278°-279°.
後処理
- customThe resulting pale yellow solid is collected
- customrecrystallized repeatedly from ethanol
出典と根拠
- ORDレコード
- ord-666ee2711a4d411f9218b12cf682ce75
- 出典データセット
- uspto-grants-1976_06
- 特許番号
- US03960892
反応ノート
読み込み中…