Abstract
AbstractThe heterogeneous reduction of various water‐insoluble ketones (i.e., alkyl phenyl ketones and alkyl methyl ketones) was carried out with an aqueous NaBH4 solution in the presence of lecithin. It was found that the rate of the reduction reaction from ketone to carbinol was enhanced by lecithin, which is known as an optically active and zwitterionic surface active substance. Furthermore, when the unsymmetric ketones were reduced in this system the carbinols obtained were found to be optically active, though their optical yields were low. From the above results, it was concluded that the reduction reaction proceeds mainly at the micelle–water interface.
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