2.3% and the double reduced substrate 8 1.2%. All products have been identified by their H-NMR spectras. Results are shown in Figure and Figure . Here we found too a strong preference for the reduction of the keto group in 9 with Chiralidon ® -R to yield 10. No further products could have been detected after 15 d. The reduction with Chiralidon ® -S showed also a preference for the keto group but a 15.1% yield of the reduce aldehyde 11 group was found after 15 days. Both catalysts reduced the substrate after 15 d not as complete as with the p-acetyl benzaldehyde 5 and the reaction rate also was lower. This might be due to sterical hindrance. In conclusion we found a new "green" environmentally friendly methode to reduce keto groups in presence of aldehyd groups with good to excellent selectivities and high ee with Chiralidon ® -R and Chiralidon ® -S a superabsorbed alcoholdehydrogenase. The advantage of the methode compared to the Luche-reduction is that no Lanthanoid-salts are needed and that the work-up procedure of the products is very simple.