Diethyl Ether → N,N-dimethyl-N-(2-phenylethyl)oxycarbonylmethyl-N-(3-(dodecanoylamino)propyl)ammonium chloride

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A 14.22 g (0.050 mol) portion of N-dodecanoyl-N′,N′-dimethyl-1,3-diaminopropane and 120 ml of diethyl ether were put into a flask, and 9.93 g (0.050 mol) of 2-phenylethyl chloroacetate was added thereto at 0 to 5° C. spending 5 minutes. The reaction mixture was further stirred at 25° C. for 24 hours, and disappearance of the most part of chloroacetate was confirmed by 1H-NMR. Next, the reaction mixture was slowly added dropwise to 600 ml of hexane which was ice-cooled and vigorously stirred, spending 10 minutes, to effect precipitation of the product as a white solid. Thereafter, in the same manner as described in Inventive Example 1, the title compound (to be referred to as betaine ester (11) hereinafter) was obtained as a white powder. Yield 20.10 g (0.0416 mol; yield 83.2%).

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