Réaction #216709

Équation de réaction

hexane ethyl ether

methyl 3-cyclododecylprop-2-enoate

magnesium

→

title compound

Rendement 61.3%

3-Cyclododecylpropanoic acid, methyl ester

Rendement 61.3%

Solvants

methanol

Conditions de réaction

Traitement

1. 1
   Température(ice bath cooling is applied when necessary to control exothermic excursions)
2. 2
   Extractionis extracted with ethyl ether (3 times)
3. 3
   LavageThe combined ethereal extracts are washed with 2N hydrochloric acid
4. 4
   Séchageare dried over magnesium sulfate
5. 5
   FiltrationFiltration and evaporation
6. 6
   Autregives an oily solid
7. 7
   Lavageas eluting solvent

Mode opératoire

To a solution of 12.6 g (50 mmol) of methyl 3-cyclododecylprop-2-enoate in 100 ml of methanol is added 3.6 g (150 mmol), 3 equiv) of magnesium metal (activated by prior heating to 160° C.) and the mixture is stirred at room temperature for 2 hours (ice bath cooling is applied when necessary to control exothermic excursions). The reaction mixture is digested with ice cold 2N hydrochloric acid and is extracted with ethyl ether (3 times). The combined ethereal extracts are washed with 2N hydrochloric acid and are dried over magnesium sulfate. Filtration and evaporation gives an oily solid. Flash chromatography on silica gel using hexane/ethyl ether (10:1) as eluting solvent affords 7.80 g of the title compound: IR 1748 cm-1 ; NMR (CDCl3) δ 1.33 (m, 23 H), 1.54 (t, 2 H, J=8 Hz), 2.31 (t, 2 H, J=8 Hz), 3.66 (s, 3H).

Source