Creation of chiral interlayer catalytic system by use of straddled pillar complexes and inorganic layer crystal hosts

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The asymmetric hydrogenation using our newly developed "chiral interlayer catalysts" is described. Generally chiral homogeneous catalyst can be created by use of bulky ligands to fix the chiral conformation. Because the main drawback of the homogenous catalytic system is usually pointed out the difficulty in catalyst separation from the products and the recycling, we have developed a new type of catalysts, i.e., chiral interlayer catalysts have been synthesized by the intercalation of chiral Rh(I) pillar complexes (Straddled chiral pillar complexes) with linear alkyl chains into lithium taeniolite (LiTN). We found that the long alkyl chain groups in the pillar complexes were held between layers as a linear chain shape and the interlayer spacing was proportional to the chain length. By means of our novel chiral interlayer catalysts, we attained the asymmetry selectivity exceeding the corresponding homogeneous catalysts as well as the comparable high activity with the homogeneous ones.