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Thread: Effect of organic and inorganic supports?

  1. #1 Effect of organic and inorganic supports? 
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    I study heterogeneous Michael-addition between isobutyraldehyde and N-phenylmaleimide. I immobilized chiral 1,2-diphenylethylenediamine catalyst on polystryrene resin and silicagel supports too.
    The first catalyst gave high enantioselectivity and conversion as well. On the other hands when I used the silicagel supported catalyst I achieved much lower values.
    I wonder what is the difference between the organic and inorganic supports?
    Can the acidic hydroxyl groups of the silica take parts of the reaction?
    Any help here would be appreciated.


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