TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Apparatus: The electrical voltage causes electro-osmotic movement of the liquid along the channel. The channel has maximum cross-section dimension of 10-400 mum, preferably 100-200 mum. The field strength of the electric voltage in the channel is at least 230 V/cm of the length. Field strength is preferably in the range of 230-330 V/cm of the length. The channel consists of several interconnecting channels. The channel is formed in an apparatus formed from two components, one component being provided with one or several grooves, and each groove corresponds to each channel. The other component has a surface to close each groove and form a channel.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: Alternately the electrical voltage is applied after supplying the carboxylic acid molecules into the liquid in the channel. Preferred Acids: The carboxylic acid molecules (I,II) are of same or different carboxylic acid. The reaction is repeated for several pairs of carboxylic acids so that each pair produces a respective product molecule which comprises stereoisomeric forms.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The channel is formed from material such as glass, silica and quartz, preferably borosilicate glass. SPECIFIC COMPOUNDS - The liquid is selected from dimethylformamide, tetrahydrofuran, methanol, dimethylsulfoxide, ethanol and acetonitrile.    EXAMPLE - The channels of a micro reactor (11) was filled with dimethylformamide. A solution of 0.1M R-phenyl butyric acid in dimethylformamide was added to one reactor (A). Dimethylformamide was added to reservoirs (B,C). Platinum electrodes were placed in reservoirs (A,C) so that electrodes contact the respective liquids. A voltage of 700-1000 V was applied to electrode in reservoir (A), which corresponds to electrical field strength of 230-330 V/cm. The voltage application causes the phenyl butyric acid solution to move from reservoir (A to C). The movement was due to electro-osmosis caused by the electrical voltage. R-phenyl butyric acid was converted into stereoisomeric product.