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Cyclopalladated Azo–linked Porous Polymers in C–C Bond Forming Reactions
Author(s) -
Xu Chao,
Afewerki Samson,
Tai CheukWai,
Córdova Armando,
Hedin Niklas
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601296
Subject(s) - chemistry , catalysis , suzuki reaction , polymer , coupling reaction , polymer chemistry , scavenger , stereoselectivity , palladium , porosity , nanoparticle , heterogeneous catalysis , combinatorial chemistry , organic chemistry , materials science , nanotechnology , radical
We designed a new cyclopalladated porous polymer (cyclo‐Pd(II)/PP‐2) with up to 20.7 wt% of Pd and investigated it as a heterogeneous catalyst for C–C bond‐forming transformations. It was also shown to be an effective scavenger for Pd 2+ in solution. The palladacycles formed along the backbone of the azo‐linked porous polymer (PP‐2) with (Pd–N) and (Pd–C) bonds as were confirmed by a combination of spectroscopies. The cyclo‐Pd(II)/PP‐2 decomposed when used for Suzuki and Heck cross‐coupling reactions, and acyclic‐Pd/PP‐2 formed with Pd nanoparticles (NPs) bound to the PP‐2. The Suzuki couplings were highly efficient in water and exhibited excellent recyclability. The cyclo‐Pd(II)/PP‐2 was also an effective heterogeneous Lewis‐acid catalyst for stereoselective carbocyclization reactions.