2-Bromo-2-methylpropionic acid synthesis
- Product Name:2-Bromo-2-methylpropionic acid
- CAS Number:2052-01-9
- Molecular formula:C4H7BrO2
- Molecular Weight:167
79-31-2
630-51-3
2052-01-9
The general procedure for the synthesis of 2,2,3,3-tetramethylbutanedioic acid and 2-bromo isobutyric acid using isobutyric acid as starting material was as follows: 0.005 moles of carboxylic acid 1 was dissolved in 20 mL of anhydrous THF under argon protection, followed by the slow dropwise addition of this solution to a pre-cooled 0.01 moles of LDA (lithium diisopropylammonium) in 30 mL of anhydrous THF. The reaction mixture was gradually warmed to 35-40°C and stirred at this temperature for 30-40 minutes. Upon completion of the reaction, the mixture was cooled to 20-25°C, followed by addition of 0.005 moles of a solution of N,N-diethyl-N-halogenated amine 3 in 20 mL of anhydrous THF. The resulting mixture was continued to be stirred for 2 hours. At the end of the reaction, it was diluted with 30 ml of distilled water and the pH was adjusted with HCl to 1. The reaction product was extracted with ether (3 x 30 ml) and the combined organic phases were dried over anhydrous Na2SO4 and subsequently concentrated. Removal of the ether gave a mixture of dicarboxylic acids 8a-8c and α-halocarboxylic acids 9a-9f. The structures of the products were confirmed by 1H NMR and 13C NMR spectroscopic analyses and the data were in agreement with those reported in the literature [2,3].
79-31-2
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$17.00/25mL
630-51-3
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2052-01-9
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Yield:630-51-3 66% ，2052-01-9 15%
Reaction Conditions:
Stage #1:isobutyric Acid with lithium diisopropyl amide in tetrahydrofuran at 0 - 40;Inert atmosphere;
Stage #2: with N,N-diethyl-N-bromoamine in tetrahydrofuran at 20 - 25; for 2 h;Inert atmosphere;
Steps:
Interaction of carboxylic acids with N,N-diethyl-N-haloamines
General procedure: A solution of 0.005 mol of carboxylic acid 1 in 20 mL of anhydrous THF was added atstirring to a solution of 0.01 mol of LDA in 30 mL of anhydrous THF cooled to 0-5° under argon atmosphere.The reaction mixture was warmed to 35-40°and stirred during 30-40 min. Then the mixture wascooled to 20-25°, and a solution of 0.005 mol ofN,N-diethyl-N-haloamine 3 in 20 mL of anhydrousTHF was added. The obtained mixture was stirredduring 2 h, and then 30 mL of distilled water was of HCl till pH 1, and the reaction products were extracted with diethyl ether (3×30 mL). Combinedextracts were dried over Na2SO4 and concentrated.After ether elimination, mixtures of dicarboxylic 8a-8c and α-halocarboxylic 9a-9f acids were obtained. Spectral parameters (1 and 13 NMR) of the products coincided with the reference data [2, 3].
References:
Zorin;Zainashev;Zorin [Russian Journal of General Chemistry,2016,vol. 86,# 11,p. 2469 - 2472][Zh. Obshch. Khim.,2016,vol. 86,# 11,p. 1826 - 1829,4]
79-31-2
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2052-01-9
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19455-20-0
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2052-01-9
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20769-85-1
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818-61-1
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2052-01-9
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213453-02-2
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100-52-7
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