Sulfuric Acid → 2-Hydroxybicyclo(2.2.1)heptane-2-carboxylic acid

107 g (1.63 mol) of potassium hydroxide (85%) and 85.7 g (542 mmol) of potassium permanganate were dissolved in 380 ml of water, and 37.9 g (271 mmol) of crude 2-norbornanecarboxylic acid in 380 ml of petroleum ether was added dropwise on ice cooling. After heating and refluxing for eight hours, the mixture was stirred at room temperature for 18 hours. The reaction mixture was slowly added to 544 ml of 6N sulfuric acid, to obtain acidified mixture, then 272 ml of an aqueous solution of 62.2 g of sodium bisulfite was added, and the mixture was stirred at room temperature for one hour. After the reaction mixture was extracted with ethyl acetate (200 ml×4), the extract was dried over anhydrous magnesium sulfate. The extract was filtered, the solvent was distilled off and 38.5 g of crude 2-hydroxy-2-norbornanecarboxylic acid was obtained. Crude yield: 92%.

1. temperatureAfter heating
2. temperaturerefluxing for eight hours
3. customto obtain
4. stirringthe mixture was stirred at room temperature for one hour
5. extractionAfter the reaction mixture was extracted with ethyl acetate (200 ml×4)
6. dry with materialthe extract was dried over anhydrous magnesium sulfate
7. filtrationThe extract was filtered
8. distillationthe solvent was distilled off

ORDレコード

ord-08f8f387251d432ca4310f5449bfd9e4

出典データセット

uspto-grants-1993_11

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US05266728