反应详情

A base solution (22 grams of NaOH in 41 milliliters (ml) of water) was added to a solution of 2,6-di-t-butyl-4-mercaptophenol (64.3 grams; 0.27 mole) in 540 ml. of absolute ethanol with stirring while cooling the reaction mixture under nitrogen. Following the base addition, a solution of 2-bromohexanoic acid (52.8 grams; 0.27 mole) in 27 ml. of ethanol was added and the resulting reaction mixture was stirred at room temperature for about 6 hours and left standing overnight. The reaction mixture was then diluted with about 400 ml. of water and acidified with cold 6N HCl. The yellow brown precipitate resulting from the acidification was obtained by filtration, washed with water and recrystallized from a methylenechloride-hexane mixture. As a result of these operations, the desired 2-((3,5-di-tert-butyl-4-hydroxyphenyl)thio)hexanoic acid compound was obtained as a white crystalline solid having a melting point of 140°-142° C. Analysis calculated for C20H32O3S: C, 68.15; H, 9.14; S, 9.10. Found: C, 68.14; H, 9.34; S, 8.86.

1. temperaturewhile cooling the reaction mixture under nitrogen
2. additionthe base addition
3. customthe resulting reaction mixture
4. waitleft
5. waitstanding overnight
6. additionThe reaction mixture was then diluted with about 400 ml
7. customThe yellow brown precipitate resulting from the acidification
8. customwas obtained by filtration
9. washwashed with water
10. customrecrystallized from a methylenechloride-hexane mixture
11. customAs a result of these operations