反应详情

1.5 g of (5-hydroxy-2-oxohexyl)triphenylphosphorane was dissolved in 20 ml of methylene chloride under a nitrogen atmosphere, cooled in dry ice/acetone bath and 15 ml of triethyloxonium tetrafluoroborate as a 1 M solution in methylene chloride was added. The reaction mixture was stirred at about -78 C. for 0.5 hour and allowed to warm to room temperature over about 2 hours, decanted into ice water and stirred vigorously with the addition of an additional 30 ml of methylene chloride. The extraction was repeated twice, the extracts combined, and solvent removed to afford the desired product, m.p. 118.5°-122° C. and having the formula ##STR8##

1. customdecanted into ice water
2. stirringstirred vigorously with the addition of an additional 30 ml of methylene chloride
3. extractionThe extraction
4. customsolvent removed