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Title: Homogeneous and Supported Niobium Catalysts as Lewis Acid and Radical Catalysts

Abstract

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.

Authors:
Publication Date:
Research Org.:
Cal State L.A. University Auxiliary Svcs, Inc.
Sponsoring Org.:
USDOE
OSTI Identifier:
922133
DOE Contract Number:  
FG26-05NT42493
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALCOHOLS; ALDEHYDES; ALKOXIDES; CATALYSTS; DRYING; LEWIS ACIDS; NIOBIUM COMPLEXES; RADICALS; CHEMICAL PREPARATION; SILICA GEL; SUBSTRATES

Citation Formats

Tikkanen, Wayne. Homogeneous and Supported Niobium Catalysts as Lewis Acid and Radical Catalysts. United States: N. p., 2006. Web. doi:10.2172/922133.
Tikkanen, Wayne. Homogeneous and Supported Niobium Catalysts as Lewis Acid and Radical Catalysts. United States. https://doi.org/10.2172/922133
Tikkanen, Wayne. 2006. "Homogeneous and Supported Niobium Catalysts as Lewis Acid and Radical Catalysts". United States. https://doi.org/10.2172/922133. https://www.osti.gov/servlets/purl/922133.
@article{osti_922133,
title = {Homogeneous and Supported Niobium Catalysts as Lewis Acid and Radical Catalysts},
author = {Tikkanen, Wayne},
abstractNote = {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.},
doi = {10.2172/922133},
url = {https://www.osti.gov/biblio/922133}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 2006},
month = {Sun Dec 31 00:00:00 EST 2006}
}