Preparation method of polyfluoro aliphatic carboxylic acid
A technology of aliphatic carboxylic acid and fluorine-containing carboxylic acid potassium salt, which is applied in the synthesis of polyfluoroaliphatic carboxylic acid surface-active compounds and in the field of polyfluoroaliphatic carboxylic Low yield and other problems, to achieve the effect of less reaction by-products, high yield, easy to purify
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Example Embodiment
[0019] Example 1
[0020] Synthesis of 2,2,3,3,4,4,5,5-octafluorovaleric acid:
[0021] In a 2L three-necked flask were sequentially added 2,2,3,3,4,4,5,5-octafluoropentanol 116.0g, 700g water, and 200g acetic acid. The temperature was raised to 80°C under stirring, 126.4g potassium permanganate was added in three times, and the reaction was kept for 4 hours. Cool to room temperature and filter to obtain a colorless transparent filtrate. The filtrate was washed three times with 300g ethyl acetate, then acidified to pH=2 with concentrated hydrochloric acid, extracted three times with 750g ethyl acetate, the extract was washed with water, added with 12g anhydrous sodium sulfate and dried for 1 hour, filtered to remove the desiccant, and concentrated to obtain The crude product was rectified to obtain 96.0 g of product 2,2,3,3,4,4,5,5-octafluorovaleric acid, and its purity was 98.5% as measured by gas chromatography. The yield was 78.0%. Product IR v: 3219.8 (-COOH), 2997.4 (H-CF ...
Example Embodiment
[0022] Example 2
[0023] In a 2L three-necked flask were sequentially added 2,2,3,3,4,4,5,5-octafluoropentanol 116.0g, 700g water, and 200g acetic acid. The temperature was raised to 80°C under stirring, 142.2g potassium permanganate was added in three times, and the reaction was kept warm for 4 hours. Cool and filter to obtain a colorless transparent filtrate. The filtrate was washed three times with 300g dichloromethane, then acidified to pH=2 with concentrated hydrochloric acid, extracted three times with 750g dichloromethane, the extract was washed with water, added with 10g anhydrous magnesium sulfate, dried, filtered to remove the desiccant for 30 minutes, and the filtrate was concentrated The crude product was obtained, and 104.6 g of product 2,2,3,3,4,4,5,5-octafluorovaleric acid was obtained by rectification, and its purity was 98.0% as measured by gas chromatography. The yield was 85.1%.
Example Embodiment
[0024] Example 3
[0025] In a 2L three-necked flask were sequentially added 2,2,3,3,4,4,5,5-octafluoropentanol 116.0g, 700g water, and 200g acetic acid. The temperature was raised to 90°C under stirring, 158.0g potassium permanganate was added in three times, and the reaction was kept warm for 5 hours. Cool and filter to obtain a colorless transparent filtrate. The filtrate was washed with 300g of dichloroethane three times, then acidified with concentrated hydrochloric acid to pH=2, extracted with 750g of dichloroethane three times, the extract was washed with water, added with 12g of anhydrous sodium sulfate and dried for 2 hours, filtered to remove the desiccant, The filtrate was concentrated to obtain a crude product, and 111.4 g of product 2,2,3,3,4,4,5,5-octafluorovaleric acid was obtained by rectification, and its purity was 98.7% as measured by gas chromatography. The yield was 90.6%.
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