- Method of Synthesizing of N-methyl-N-trimethylsilyl trifluoroacetamide, N-methyl-N-trimethylsilyl trifluoroacetamide synthesized thereby and an electrolyte for lithium secondary battery including the same
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The present invention relates to a synthesis method of N-methyl-N-trimethylsilyl trifluoroacetamide (MSTFA), MSTFA synthesized thereby and an electrolyte for a lithium secondary battery including the same. The present invention comprises the steps of: preparing N-methyltrifluoroacetamide by using ethyltrifluoroacetate and methylamine; and obtaining MSTFA by separating and removing a precipitate from a reaction mixture obtained by introducing trimethylsilyl chloride to a mixture of N-methyltrifluoroacetamide and triethylamine. According to the present invention, since BSA (N,O-bis(trimethylsilyl)acetamide) is not used, it is relatively easy to remove a starting material and a side reaction material which are not reacted by fractional distillation. Therefore, it is possible to obtain a high-purity MSTFA of 99.0% or more and if the high-purity MSTFA of 99.0% or more is used as an additive of an electrolyte for a lithium secondary battery, it is possible to improve lifespan characteristics of a lithium secondary battery.COPYRIGHT KIPO 2015
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Paragraph 0021-0022; 0058-0059
(2016/12/16)
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- Carbacephalosporin compound, their preparation and use
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Carbacephalosporin compounds of formula (I), STR1 salts thereof, processes for their synthesis and uses thereof, wherein: R1 is hydrogen, methoxy or formamido; R2 is an acyl group; CO2 R3 is a carboxy group or a carboxylate anion, or R3 is a carboxy protecting group or a pharmaceutically acceptable salt-forming group or in vivo hydrolysable ester group; R4, R5, R6 and R7 represent hydrogen or a substituent; R4 and R7 may be replaced by a chemical bond between the two carbon atoms shown; R5 and R6 may be linked together into a cyclic system. The compounds (I) have antibacterial properties.
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- Bis-trimethylsilyl cefamandole and process therefor
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Bis-trimethylsilyl cefamandole is useful for regenerating cefamandole of excellent purity.
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