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General Information
Category: advanced materials
BSA 04-03: Recyclable Catalysts
BNL Reference Number: BSA 04-03
Patent Status: U.S. Patent Number 7,005,525 was issued on February 28, 2006
Summary
Proposed mechanism for catalytic ionic hydrosilylation: a, Ketone complex 4W before adding HSiEt3. b, HSiEt3added, liquid not yet mixed. c, Mixed and homogeneous. d, Liquid clathrate formed. Reaction nearing completion. e, End of reaction. Catalyst has precipitated.
Homogeneous catalysts are usually more selective than heterogeneous catalysts, but they are often difficult to recycle. This organometallic complex containing molybdenum or tungsten and not containing a precious metal can be used to catalyze the hydrogenation and/or hydrosilylation of an organic compound. At the end of the reaction, the molybdenum or tungsten precipitates and can be recovered. Mild process conditions can be used to generate the catalyst, in line with the objectives of “green chemistry.”
Description
Catalysts and catalytic processes for homogenous catalytic hydrogenation of ketones and aldehydes to alcohols with hydrogen as the stoichiometric redundant and organometallic tungsten and molybdenum complexes as the catalysts are recoverable.
Benefits
These catalysts use less costly materials instead of precious metals, reducing catalyst cost. They are also recyclable. The catalysts have broad applicability, catalyzing hydrogenation of aldehydes and ketones and hydrosilylation of aldehydes, ketones, and esters.
Applications and Industries
The catalysts can be used in hydrogenation and hydrosilylation of carbonyl compounds.
Journal Publication
Have Questions?
For more information about this technology, contact Kimberley Elcess, (631) 344-4151.
