Abstract
AbstractIncorporation of phosphine‐Pd catalytic centers in gel network is an important strategy to develop highly active catalysts. In this contribution we show that catalytically active phosphine‐Pd(II) gels can be readily obtained via reaction of rigid bridging terpyridyl phosphines and Pd(II). The terpyridyl phosphines, Py2P2 and Py2P, contain one 4,2′:6′,4′ ′‐terpyridyl group and two/one diphenylphosphino groups. Reactions of Py2P2/Py2P and Pd(II) in CHCl3‐MeOH afforded the corresponding phosphine‐Pd(II) gels at room temperature or at elevated temperature (40°C). The gelation is driven by formation of metal‐organic coordination. Mild heating is important in triggering the formation of Py2P‐Pd(II) gel. The gels have a coherent, rigid spongy porous network of continuous nanometer‐sized particles. The phosphine‐Pd(II) gels showed high activity in the Suzuki‐Miyaura reactions of aryl bromides under ambient conditions and could be recycled and reused.
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