[CH3:1][O:2][CH2:3][C:4]([OH:6])=O.COCC([Cl:12])=O.[CH3:13][N+:14]([CH2:17][CH:18]([OH:23])[CH2:19][C:20]([O-:22])=[O:21])([CH3:16])[CH3:15]>C(#N)C>[CH3:1][O:2][CH2:3][C:4]([C:18]([CH2:19][C:20](=[O:21])[O-:22])([CH2:17][N+:14]([CH3:13])([CH3:15])[CH3:16])[OH:23])=[O:6].[Cl-:12]A mixture of methoxyacetic acid (3 ml; 0.04 moles) and methoxyacetyl chloride (3 ml; 0.03 moles) was kept under stirring at 30° C. for 2 hours. To this mixture carnitine chloride (4 g; 0.02 moles) which had been previously dried was added. The resulting mixture was brought to 40° C. and kept under stirring for seven days. The mixture was then taken up with acetonitrile and the unreacted carnitine chloride was filtered off. Upon addition of tert-butyl methyl ether an oil precipitated. The oil precipitation was repeated four times with acetonitrile/tert butyl methyl ether. The oil which finally separated was lyophilized. Four grams of methoxy acetyl carnitine chloride were thus obtained. Yield: 75%
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