Synthesis method of high-purity D-2-chloropropionyl chloride
A technology of D-2-, chloropropionyl chloride, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve the problem of unsuitable chemical plant economic cycle use, the purity of D-2-chloropropionyl chloride The problem is not high, the products and by-products are not easy to separate, etc., to achieve the effect of low equipment requirements, high reaction yield and purity, and easy handling
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Embodiment 1
[0020] Step a, synthetic D-2-methyl chloropropionate
[0021] Add 110g of L-lactate methyl ester and 1.5g of pyridine to the dry reaction flask with stirring and condensation, cool down to -7°C in an ice-salt bath, add 140g of thionyl chloride dropwise, control the system temperature below 0°C, and add dropwise for 2 hours After completion, the ice-salt bath was pulled down and vacuum stirred for 1 hour, then the temperature was raised to 80°C, and refluxed for 4 hours. After the reaction solution dropped to 35°C, the SOCl gas was removed under reduced pressure. 2 , SO 2 Wait for the gas, after the gas is basically pumped out, add 30g of tap water and wash for 10min to obtain 128g of methyl chloropropionate with a yield of 99.2% and a purity of 99.6%.
[0022] Step b, synthesis of D-2-chloropropionic acid
[0023] Add 120g of methyl chloropropionate to the reaction flask with stirring, add 228g of 20% sodium hydroxide solution dropwise at a temperature below 10°C, finish add...
Embodiment 2
[0027] Step a, synthetic D-2-methyl chloropropionate
[0028] Add 150g of L-lactate methyl ester and 1.5g of pyridine to the dry reaction flask with stirring and condensation, cool down to -2°C in an ice-salt bath, add 190g of thionyl chloride dropwise, control the system temperature below 0°C, and add dropwise for 3 hours After completion, the ice-salt bath was pulled down and vacuum stirred for 2 hours, and then the temperature was raised to 60°C, and refluxed for 5 hours. After the reaction solution dropped to 35°C, the gases such as SOCl2 and SO2 were removed under reduced pressure. 174.6 g of methyl chloropropionate was obtained, with a yield of 99.2% and a purity of 99.4%.
[0029] Step b, synthesis of D-2-chloropropionic acid
[0030] Add 135g of methyl chloropropionate to a reaction flask with stirring, add 400g of 20% sodium hydroxide solution dropwise at a temperature below 5°C, and finish adding dropwise in 2 hours, keep warm at a temperature below 5°C for 3 hours,...
Embodiment 3
[0034] Step a, synthetic D-2-methyl chloropropionate
[0035] Add 150g of L-lactate methyl ester and 1.5g of pyridine to the dry reaction flask with stirring and condensation, cool down to -10°C in an ice-salt bath, add 190g of thionyl chloride dropwise, control the system temperature below 0°C, and add dropwise for 3 hours After completion, the ice-salt bath was pulled down and vacuum stirred for 2 hours, and then the temperature was raised to 55°C, and refluxed for 5 hours. After the reaction solution dropped to 35°C, the gases such as SOCl2 and SO2 were removed under reduced pressure. 174.6 g of methyl chloropropionate was obtained, with a yield of 99.2% and a purity of 99.4%.
[0036] Step b, synthetic D-2-chloropropionic acid
[0037] Add 135g of methyl chloropropionate to the reaction flask with stirring, add 270g of sodium hydroxide solution with a mass fraction of 20% below 5°C dropwise, after 2 hours to complete the dropwise addition, keep warm at below 5°C for 3 hou...
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