Polymer-supported organometallic compounds of titanium,zirconium and hafnium as hydrogenation catalysts |
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Authors: | E.S. Chandrasekaran R.H. Grubbs C.H. Brubaker |
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Affiliation: | Department of Chemistry, Michigan State University, East Lansing, MI 48824 USA |
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Abstract: | Cyclopentadienyl compounds of titanium, zirconium and hafnium have been prepared attached to polymers by first binding cyclopentadiene to styrene-divinylbenzene (20%) copolymers and then converting them to cyclopentadienyl anions. The resin-bound anions were treated with MCln and polymer-attached Mcln?1 compounds were formed (where M = Ti, Zr and Hf). The polymer-attached monocyclopentadienyl titanium trichloride on reduction with butyl lithium produces active catalysts whose hydrogenation efficiencies are 10 to 20 times as great as the corresponding non-attached species under the same conditions. Studies of the physical nature of the metal catalyst dispersions on the polymer supports by using an electron-X-ray fluorescence microprobe indicate that the dispersion is uniform throughout the entire section of the bead. |
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