Carbon Dioxide → 3-(Trimethylsilyl)butanoic acid
Reaction equation
BrC[CH2:3][CH2:4][Si:5]([CH3:8])([CH3:7])[CH3:6].[Mg].[C:10](=[O:12])=[O:11].[CH3:13]COCC>>[CH3:6][Si:5]([CH3:8])([CH3:7])[CH:4]([CH3:13])[CH2:3][C:10]([OH:12])=[O:11]Participants
5
Procedure
A solution containing 3 g (15.4 mmol) of (3-bromopropyl)trimethylsilane in 3 ml of dry ether was added to 0.375 g (15.4 mmol) of magnesium turnings in ether (40 ml final volume of solution). After 1 hour of reflux gazeous carbondioxide was bubbled through the reaction mixture (3 g, 77 mmol of dry ice). After 2 hours of stirring at room temperature the reaction mixture was partitioned between aqueous ammonium chloride and ether. The organic phase was separated, the aqueous phase was further acidified with hydrochloric acid 1N and extracted with ether. Ethereal phases were pooled and the solvent was removed under reduced pressure. Separation of the expected 4-trimethylsilylbutanoic acid from dimer of starting (3-bromopropyl)trimethylsilane was finally performed by acid base extraction. 0.62 g of 3-(trimethylsilyl)-butanoic acid was isolated as a colorless liquid.