Subscribe to RSS
DOI: 10.1055/s-2005-921698
Recyclable Polymer-Supported Pd Catalysts for Aryl Amination Reactions
M. Guinó , K. K. (M.) Hii*
Imperial College London, UK
Publication History
Publication Date:
16 December 2005 (online)
![](https://www.thieme-connect.de/media/synfacts/200601/lookinside/thumbnails/10.1055-s-2005-921698-1.jpg)
Significance
The authors have prepared polymer-supported palladium catalysts from three commercially available phosphine-functionalized polystyrenes, Pd2(dba)3, and P(t-Bu)3. The stability of the catalysts is dependent on the method of preparation and the nature of the polymer-bound phosphine. Thus, substantial catalyst leaching (determined by VT 31P NMR spectroscopy) and/or decomposition (indicated by the deposition of palladium black) were observed for all the catalysts prepared by method A. The catalyst (PS-PCy2)Pd[P(t-Bu)3], prepared by method B, was stable even at 100 ºC, though leaching was observed in the case of catalysts prepared from PS-PPh2 and PS-CH2PPh2. (PS-PCy2)Pd[P(t-Bu)3] prepared by method B can be reused in the amination of chlorotoluene without loss in yield (first run: >95%, second run: >95%).