Реакция #216207

Уравнение реакции

product

2-[4-(4-chlorophenyl)cyclohexyl]-3-Chloro-1,4-naphthoquinone

potassium hydroxide

hydrochloric acid

→

title product

2-[4-(4-chlorophenyl)cyclohexyl]-3-hydroxy-1,4-naphthoquinone

Растворители

methanol

water

Условия реакции

Обработка

1. 1
   ТемператураThe mixture was refluxed until a dark red solution
2. 2
   Другоеformed
3. 3
   ТемператураThe mixture was cooled
4. 4
   Фильтрацияfiltered
5. 5
   Промывкаthe solid residue washed thoroughly with water
6. 6
   Фильтрацияfiltered
7. 7
   ДругоеThe combined solid residues (500 mg) mp 200°-209°, were recrystallised from acetonitrile

Методика

The product of stage (b) was suspended in 10 ml of boiling methanol and 0.55 g of potassium hydroxide in 5.5 ml of water was added dropwise over 15 mins. The mixture was refluxed until a dark red solution formed, (after ca. 6 hrs) when 2 ml of concentrated hydrochloric acid was cautiously added dropwise. The mixture was cooled and filtered, and the solid residue washed thoroughly with water. The water washings were re-acidified and filtered. The combined solid residues (500 mg) mp 200°-209°, were recrystallised from acetonitrile to give the title product as the trans-isomer (300 mg) m.p. 216°-219° C.

Источник