Abstract
It is now beyond doubt that enzymes can vigorously work even in neat organic solvents containing little or no water. Switching the enzymatic reaction medium from aqueous to nonaqueous can make previously problematic processes feasible through, for example, increased substrate solubility or diminished side reactions. Moreover, when placed in this highly unnatural milieu, enzymes exhibit new and potentially valuable properties, including greater stability, markedly altered selectivity that can be readily controlled by the solvent, and molecular memory. Consequently, novel synthetic and biotechnological opportunities ensue, as illustrated herein by those based on enzymatic oxidoreductions such as the asymmetric peroxidase-catalyzed sulfoxidation of organic sulfides.
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