Реакция #5762

Уравнение реакции

water

oxalic acid

2-(1-methylethyl)-5,9,13-trimethyl-2,4,8,12-tetradecatetraenenitrile

diisobutylaluminium hydride

→

2 -(1-methylethyl)-5,9,13-trimethyl-2,4,8,12-tetradecatetraenal

Выход 84.0%

Растворители

n-hexane

n-hexane

n-hexane

toluene

Условия реакции

Обработка

1. 1
   Другоеthe cooling bath was removed
2. 2
   workup.STIRRINGthe reaction mixture was stirred well
3. 3
   ДругоеResultant white precipitates
4. 4
   Фильтрацияwere filtered
5. 5
   Промывкаwashed
6. 6
   КонцентрированиеThe filtrate was concentrated
7. 7
   Другоеto give a residue, which
8. 8
   workup.STIRRINGstirred for 3 hours
9. 9
   ЭкстракцияThe organic layer was extracted
10. 10
    Другоеseparated
11. 11
    Промывкаwashed with water
12. 12
    Сушкаdried over MgSO4
13. 13
    Концентрированиеconcentrated

Методика

To a solution of 2-(1-methylethyl)-5,9,13-trimethyl-2,4,8,12-tetradecatetraenenitrile (856 mg, 3.0 mmol) in n-hexane (30 ml) was added a 0.5 M solution of diisobutylaluminium hydride in toluene (6 ml) with stirring at -70° C. under argon atmosphere. After one hour, water (3 ml) was added, the cooling bath was removed, and the reaction mixture was stirred well. Resultant white precipitates were filtered and washed. The filtrate was concentrated to give a residue, which was dissolved in n-hexane (10 ml). The n-hexane solution was combined with a 10% aqueous solution of oxalic acid (5 ml) and stirred for 3 hours. The organic layer was extracted and separated, washed with water, dried over MgSO4, and concentrated. The resultant residue was subjected to silica gel column chromatography (solvent: n-hexane/ethyl acetate=10:1) to obtain 2 -(1-methylethyl)-5,9,13-trimethyl-2,4,8,12-tetradecatetraenal (865 mg, 84%).

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