Homogeneous and Supported Niobium Catalysts as Lewis Acid and Radical Catalysts
- Cal State L.A. University Auxiliary Svcs, Inc.
The synthesis of tetrachlorotetraphenylcyclopentadienyl group 5 metal complexes has been accomplished through two routes, one a salt metathesis with lithiumtetraphenylcyclopentadiende and the other, reaction with trimethyltintetraphenylcyclopentadiene. The reactants and products have been characterized by {sup 1}H and {sup 13}C({sup 1}H) NMR spectroscopy. The niobium complex promotes the silylcyanation of butyraldehyde. The grafting of metal complexes to silica gel surfaces has been accomplished using tetrakisdimethylamidozirconium as the metal precursor. The most homogeneous binding as determined by CP-MAS {sup 13}C NMR and infrared spectroscopy was obtained with drying at 500 C at 3 mtorr vacuum. The remaining amido groups can be replaced by reaction with alcohols to generate surface bound metal alkoxides. These bound catalysts promote silylcyanation of aryl aldehydes and can be reused three times with no loss of activity.
- Research Organization:
- Cal State L.A. University Auxiliary Svcs, Inc.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG26-05NT42493
- OSTI ID:
- 922133
- Country of Publication:
- United States
- Language:
- English
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