تفاعل #2450

معادلة التفاعل

water

9-hydroxymethyl-7, 12-dioxaspiro[5,6]dodecane

p-toluenesulphonic acid

→

9-(2-hydroxyethyl)-7, 11-dioxaspiro[5,5]undecane

المذيبات

benzene

ظروف التفاعل

المعالجة

1. 1
   أخرىThe benzene layer was separated
2. 2
   استخلاصthe aqueous layer extracted with benzene
3. 3
   تجفيفThe combined benzene solution was dried over K2CO3
4. 4
   أخرىevaporate to a residue (4 g)

الإجراء التجريبي

A solution of 9-hydroxymethyl-7, 12-dioxaspiro[5,6]dodecane of the formula V (4 g) of the drawings in benzene (15 ml) was stirred at 10° C. for 5 hr with anhydrous p-toluenesulphonic acid (0.2 g). The reaction mixture was made alkaline by adding TEA and water. The benzene layer was separated and the aqueous layer extracted with benzene. The combined benzene solution was dried over K2CO3 and evaporate to a residue (4 g). It was chromatograped on silicagel using chloroform-methanol mixture as eluent to give 9-(2-hydroxyethyl)-7, 11-dioxaspiro[5,5]undecane of formula VI (2.8 g) (70%) of the drawings as colorless viscous liquid.

المصدر