Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 354, Issue 6, Pages 1061-1068Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201100761
Keywords
amination; cross-coupling; gold; ligand effects; palladium; supported catalysts
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
- Japan Science and Technology Agency (JST)
- Noguchi Institute, Japan
- Grants-in-Aid for Scientific Research [24390023, 23246013, 11J03163, 23659049] Funding Source: KAKEN
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A stable heterogeneous catalyst precursor, sulfur-modified gold-supported palladium material (SAPd), has proved to be an excellent source of leached, ligand-free, Pd for the amination of aryl bromides and chlorides. The reaction-enabling catalyst is provided in situ as leached Pd in low catalyst loading (0.21 +/- 0.02 mol%). This allows the precatalyst (SAPd) to be filtered off and used for a minimum of ten reaction cycles without loss of catalytic activity. SAPd released only trace amounts, less than 0.6 ppm, of highly active Pd during the reaction without any aggregation.
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