Synfacts 2010(1): 0107-0107  
DOI: 10.1055/s-0029-1218496
Organo- and Biocatalysis
© Georg Thieme Verlag Stuttgart ˙ New York

Catalysts in a Bottle

Contributor(s): Benjamin List, Kristina Zumbansen
J.-P. Lindner, C. Röben, A. Studer*, M. Stasiak, R. Ronge, A. Greiner*, H.-J. Wendorff*
Westfälische Wilhelms-Universität, Münster and Philipps-Universität Marburg, Germany
Further Information

Publication History

Publication Date:
21 December 2009 (online)

Significance

A reusable dendritic catalyst ‘bottled’ in poly(p-xylene) (PPX) nanotubes is reported. The catalyst is synthesized by co-electrospinning poly(amidoamine) (PAMAM) dendrimers and poly(ethylene oxide) (PEO); the nanofibers are then coated with a PPX layer of [2.2]-para-cyclophane by chemical vapor deposition (CVD). A subsequent removal of the PEO core by extraction leaves the PAMAM dendrimers inside the PPX tubes. This new type of immobilized catalyst can catalyze Knoevenagel condensations in good yields. Catalyst recovery was readily achieved and could be reused for another nine runs without any loss in reactivity. The dendritic catalyst could be further functionalized by 2,2,6,6-tetramethylpiperidine-N-oxyl-radical (TEMPO) moieties. This catalyst was successfully studied in a TEMPO-mediated alcohol oxidation.