| Aqueous-phase hydroformylation of 1-octene using hydrophilic sulfonate salicylaldimine dendrimers. | |
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MedLine Citation:
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PMID: 23023586 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Water-soluble dendritic ligands based on tris-2-(5-sulfonato salicylaldimine ethyl)amine () and DAB-(5-sulfonato salicylaldimine) () (DAB = diaminobutane) were synthesized by means of Schiff base condensation and sulfonation reactions. These dendritic ligands were fully characterized by (1)H NMR, (13)C NMR and FT-IR spectroscopy, elemental analysis and mass spectrometry. Dendritic ligands ( and ) in combination with [RhCl(COD)](2) (COD = 1,5-cyclooctadiene) were evaluated in aqueous biphasic hydroformylation of 1-octene. New water-soluble mononuclear 5-sulfonato propylsalicylaldimine Rh(i) complexes ( and ) were synthesized and characterized using (1)H NMR, (13)C NMR and FT-IR spectroscopy, elemental analysis as well as mass spectrometry. These complexes were applied as catalyst precursors in aqueous biphasic hydroformylation reactions. All the catalyst precursors were active in the hydroformylation of 1-octene under the investigated conditions. Optimal conditions were realized at 75 °C (40 bars), where the best selectivity for aldehydes was noticed. Catalyst recycling was achieved up to 5 times with minimal loss in conversion and consistent chemoselectivities and regioselectivities. Less Rh leaching was observed in the dendritic systems ( and )/[RhCl(COD)](2) as compared to mononuclear catalyst precursors ( and ) as determined by inductively coupled plasma-mass spectrometry (ICP-MS). |
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Authors:
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Emma B Hager; Banothile C E Makhubela; Gregory S Smith |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-10-1 |
Journal Detail:
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Title: Dalton transactions (Cambridge, England : 2003) Volume: - ISSN: 1477-9234 ISO Abbreviation: Dalton Trans Publication Date: 2012 Oct |
Date Detail:
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Created Date: 2012-10-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101176026 Medline TA: Dalton Trans Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Chemistry, University of Cape Town, Rondebosch 7701, Cape Town, South Africa. Gregory.Smith@uct.ac.za. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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