تفاعل #2386361

معادلة التفاعل

potassium tert-butoxide

triphenylphosphine ethyl bromide

2,6-dimethoxy-4-hydroxybenzaldehyde

→

3,5-dimethoxy-4-propylphenol

المردود 55.7%

المذيبات

tetrahydrofuran

ظروف التفاعل

المعالجة

1. 1
   workup.STIRRINGfor stirring at room temperature for 30 minutes
2. 2
   workup.STIRRINGfor stirring at room temperature for 2 hours
3. 3
   أخرىThe resulting solution was partitioned between ethyl acetate and dilute hydrochloric acid
4. 4
   غسيلthe resulting ethyl acetate phase was washed in water and subsequently in an aqueous saturated sodium chloride solution
5. 5
   تجفيفdried over anhydrous magnesium sulfate
6. 6
   workup.DISTILLATIONto distill off the solvents under reduced pressure
7. 7
   أخرىThe residue was purified by silica gel column chromatography (developing solvent:hexane:ethyl acetate=2:1)
8. 8
   workup.ADDITIONfollowed by addition of a catalytic amount of platinum dioxide for hydrogenation

الإجراء التجريبي

Anhydrous tetrahydrofuran (36 ml) was added to triphenylphosphine ethyl bromide (12.3 g) prior to stirring at room temperature for 20 minutes. To the resulting mixture was added potassium tert-butoxide (4.5 g), for stirring at room temperature for 30 minutes. Then, 2,6-dimethoxy-4-hydroxybenzaldehyde (3.0 g) was added to the resulting mixture for stirring at room temperature for 2 hours. The resulting solution was partitioned between ethyl acetate and dilute hydrochloric acid, and the resulting ethyl acetate phase was washed in water and subsequently in an aqueous saturated sodium chloride solution and dried over anhydrous magnesium sulfate, to distill off the solvents under reduced pressure. The residue was purified by silica gel column chromatography (developing solvent:hexane:ethyl acetate=2:1), followed by addition of a catalytic amount of platinum dioxide for hydrogenation, to recover 3,5-dimethoxy-4-propylphenol (1.8 g; yield of 55%). By 1H-NMR (90 MHz, CDCl3), the compound has the peaks shown below.

المصدر