反応式
[CH3:1][C:2]1[S:3][C:4]([CH3:9])=[CH:5][C:6]=1[CH:7]=[O:8].P([O-])(O)(O)=[O:11].[Na+].[OH-].[Na+]>C(#N)C.O.OO>[CH3:1][C:2]1[S:3][C:4]([CH3:9])=[CH:5][C:6]=1[C:7]([OH:11])=[O:8]参加物
実験手順
Phosphorus oxychloride (10 ml) was slowly added dropwise to dimethylformamide (30 g) under ice-cooling, and 2,5-dimethylthiophene (11.2 g) was added. The mixture was stirred at 100° C. for 15 hours, poured into water and extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give 2,5-dimethyl-3-thiophenecarbaldehyde (1.41 g). 2,5-Dimethyl-3-thiophenecarbaldehyde (3.89 g) synthesized in this manner was dissolved in acetonitrile (30 ml), and sodium dihydrogen phosphate (1.2 g) in water (15 ml) and 30% aqueous hydrogen peroxide (3.5 ml) were added dropwise. The mixture was stirred at room temperature for 2 hours, alkalified with 1N aqueous sodium hydroxide and washed with diethyl ether. The aqueous layer was acidified with 1N hydrochloric acid and extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate and concentrated under reduced pressure to give 2,5-dimethyl-3-thiophenecarboxylic acid (4.09 g) as crystals.
後処理
- washwashed with diethyl ether
- extractionextracted with ethyl acetate
- dry with materialThe extract was dried over anhydrous magnesium sulfate
- concentrationconcentrated under reduced pressure
出典と根拠
- ORDレコード
- ord-9f534f451f654a38b945d089223ed77d
- 出典データセット
- uspto-grants-1998_11
- 特許番号
- US05840917
関連ノート
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