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Correlating the Activity of Rhodium(I)-Phosphite-Lariat Ether Styrene Hydroformylation Catalysts with Alkali Metal Cation Binding through NMR Spectroscopic Titration Methods
- Source :
- Organometallics. 35:2609-2620
- Publication Year :
- 2016
- Publisher :
- American Chemical Society (ACS), 2016.
-
Abstract
- Alkali metal salts can affect both the activities and regioselectivities of alkene hydroformylation catalysts containing polyether-functionalized phosphorus-donor ligands; however, it is unclear whether these effects arise from direct alkali metal cation binding to the active catalysts. To gain more insight into these effects, a series of phosphite-lariat ether ligands derived from the alkali metal cation binding agents 2-hydroxymethyl-12-crown-4 and 2-hydroxymethyl-15-crown-5 have been prepared. Rhodium(I) complexes of these ligands have been evaluated as styrene hydroformylation catalysts in the absence and presence of a variety of alkali metal salts. The activities of catalysts containing phosphites derived from 2,2′-biphenol or 1,1′-binaphthol increased significantly (up to 92%) in the presence of alkali metal cations that are “moderately oversized” for archetypal binding to the crown cavity. When this criterion are not met, a decrease in the catalytic activity is observed upon addition of an alkali m...
- Subjects :
- chemistry.chemical_classification
Cation binding
010405 organic chemistry
Alkene
Organic Chemistry
chemistry.chemical_element
Ether
010402 general chemistry
Alkali metal
01 natural sciences
0104 chemical sciences
Styrene
Rhodium
Catalysis
Inorganic Chemistry
chemistry.chemical_compound
chemistry
Polymer chemistry
Organic chemistry
Physical and Theoretical Chemistry
Hydroformylation
Subjects
Details
- ISSN :
- 15206041 and 02767333
- Volume :
- 35
- Database :
- OpenAIRE
- Journal :
- Organometallics
- Accession number :
- edsair.doi...........a16f309dafc1ea0ef4a3db47b8aa0509