تفاعل #1843068

معادلة التفاعل

dimethylformamide

phosphoric acid

5-Bromo-2,2-diphenyl-1,3-benzodioxol

butyllithium

→

2,2-diphenyl-1,3-benzodioxol-5-carbaldehyde

المذيبات

ethyl acetate

tetrahydrofuran

n-hexane

ظروف التفاعل

المعالجة

1. 1
   workup.WAITthe mixture is left
2. 2
   أخرىthe organic phase is separated
3. 3
   أخرىevaporated
4. 4
   أخرىThe residue is recrystallized from 130 ml of ethanol

الإجراء التجريبي

5-Bromo-2,2-diphenyl-1,3-benzodioxol (70 g) in 440 ml of tetrahydrofuran are treated at -78° C. with 125 ml of a 1.6M solution of butyllithium in n-hexane. After 10 minutes 40 ml of dimethylformamide are added thereto and the mixture is left to warm to -10° C. Thereafter, 70 ml of 20% aqueous phosphoric acid and 500 ml of ethyl acetate are added, the organic phase is separated and evaporated. The residue is recrystallized from 130 ml of ethanol. 49.5 g of 2,2-diphenyl-1,3-benzodioxol-5-carbaldehyde are obtained.

المصدر