Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 350, Issue 13, Pages 2065-2076Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200800304
Keywords
core-shell microspheres; Heck reaction; leaching; palladium; polymerization; Suzuki reaction
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Funding
- National Science Foundation of China [20504016]
- Program for New Century Excellent Talents in University [NCET-06-0216]
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The pH-responsive core-shell microspheres of poly(styrene-co-methylacrylic acid) (PS-co-PMAA) containing a polystyrene (PS) core and a poly (methylacrylic acid) (PMAA) shell are synthesized by one-stage soap-free copolymerization and the catalyst system palladium-iminodiacetic acid (IDA-Pd) is immobilized on the outer shell-layer of the core-shell microspheres to form the quasi-homogeneous and easily accessible catalyst PS-co-PMAA-IDA-Pd. This quasi-homogeneous PS-co-PMAA-IDA-Pd catalyst is highly dispersed in the reaction medium just like a homogeneous one and can be separated like a heterogeneous catalyst by adjusting the pH of the reaction medium. Suzuki reactions employing the quasi-homogeneous PS-co-PMAA-IDA-Pd catalyst are efficiently performed in water as the sole solvent under mild conditions such as room temperature., The PS-co-PMAA-IDA-Pd catalyst is also used in Heck reactions of a wide range of aryl halides with styrene and proves to be efficient in aqueous solution. The PS-co-PMAA-IDA-Pd catalyst has a low leaching loss and can be reused at least 4 times without loss of activity.
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