The L- ascorbic acid and acetone by reacting a blank and under the acid catalyst generated in the first step, a first step of generating a -L- ascorbic acid (1-methyl-butylidene) 5,6-O- 5, (1-methyl-butylidene) 6-O- -L- ascorbic acid and by reacting the alkylating agent in the presence of a base 3-O- alkyl -5,6-O- (1-methyl-butylidene on) -L- a second step of generating ascorbic acid 3-O- alkyl -5,6-O- (1- methyl butylidene) -L- in the production method of the ascorbic acid, the first step is two electric , 2-dimethoxy-3-O- alkyl -5,6-O- -L- method of producing ascorbic acid (1-methyl-butylidene a) is characterized as done in the presence of propane. ; According to the present invention, since the separation and purification without the -L- ascorbate (in 1-methyl-butylidene) reaction of the intermediate, 5,6-O-, the first process and the second process can be performed in the same reaction liquid system Therefore, the reaction process is extremely simple. ; According to the present invention, as, industrial production methods by performing the first step and the second step in the same reaction liquid system, are also advantageously to also operate as a gyeongjesang. ; According to the present invention, the first step is 2,2-electricity that is conducted in the presence of dimethoxypropane, since the first step of the reaction to proceed quantitatively, 3-O- which can satisfy industrially alkyl -5 , (1-methyl-butylidene) 6-O- can be obtained a yield of -L- ascorbate. ; 3-O- alkyl -5,6-O- (1-methyl-butylidene) -L- ascorbate
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