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Synthesis 2008(12): 1965-1970
DOI: 10.1055/s-2008-1067095
DOI: 10.1055/s-2008-1067095
SPECIALTOPIC
© Georg Thieme Verlag Stuttgart · New York
Sterically Demanding, Zwitterionic Trialkylphosphonium Sulfonates as Air-Stable Ligand Precursors for Efficient Palladium-Catalyzed Cross-Couplings of Aryl Bromides and Chlorides
Weitere Informationen
Received
15 February 2008
Publikationsdatum:
16. Mai 2008 (online)
Publikationsverlauf
Publikationsdatum:
16. Mai 2008 (online)
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Abstract
3-(Di-tert-butylphosphonium)propane sulfonate (DTBPPS) and 3-(diadamantylphosphonium)propane sulfonate (DAPPS) are air-stable pre-ligands for aqueous-phase palladium-catalyzed cross-coupling reactions. Both DTBPPS and DAPPS were found to give active catalysts for the Sonogashira coupling of aryl bromides at room temperature and 4-chloroanisole at 80 °C. These ligands also gave effective catalysts for the aqueous-phase Suzuki coupling of aryl bromides at room temperature.
Key words
palladium - cross-coupling - ligands - aqueous-phase catalysis - aryl halides
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