Differently carboxylic acid end-functionalized poly(lactic acid) (PLA)-based stereocomplexes were used as polymer support to stabilize Pd-nanoparticles (NPs) generated by the metal vapor synthesis technique. The dispersion of Pd was strongly dependent on the end-group present in the polymer structure, as shown by HRTEM measurements. 2,2 0-Bipyridine-and pyridine-based stereocomplexes showed high metal dispersion (i.e. well-separated Pd-NP size of 2.0 ± 0.6 nm), whereas stereocomplexes bearing ben-zyl and carboxylic acid end groups exhibited strong Pd-NPs aggregation. The heterogenous catalysts were employed to chemoselectively hydrogenate the C@C double bond in cinnamaldehyde, showing for Pd-NPs, stabilized by the 2,2 0-bipyridine-modified polymer support, the best performance in terms of chemoselectivity (99%) and recyclability in THF solution. Even under bulk cinnamaldehyde hydrogena-tion conditions, chemoselectivity for 3-phenylpropanal of 90% at 88% conversion was obtained.
Palladium-nanoparticles on end-functionalized poly(lactic acid)-based stereocomplexes for the chemoselective cinnamaldehyde hydrogenation: Effect of the end-group / Oberhauser, Werner; Evangelisti, Claudio; Jumde, Ravindra P.; Petrucci, Giorgio; Bartoli, Mattia; Frediani, Marco; Mannini, Matteo; Capozzoli, Laura; Passaglia, Elisa; Rosi, Luca. - In: JOURNAL OF CATALYSIS. - ISSN 0021-9517. - STAMPA. - 330:(2015), pp. 187-196. [10.1016/j.jcat.2015.07.012]
Palladium-nanoparticles on end-functionalized poly(lactic acid)-based stereocomplexes for the chemoselective cinnamaldehyde hydrogenation: Effect of the end-group
PETRUCCI, GIORGIO;BARTOLI, MATTIA;FREDIANI, MARCO;MANNINI, MATTEO;ROSI, LUCA
2015
Abstract
Differently carboxylic acid end-functionalized poly(lactic acid) (PLA)-based stereocomplexes were used as polymer support to stabilize Pd-nanoparticles (NPs) generated by the metal vapor synthesis technique. The dispersion of Pd was strongly dependent on the end-group present in the polymer structure, as shown by HRTEM measurements. 2,2 0-Bipyridine-and pyridine-based stereocomplexes showed high metal dispersion (i.e. well-separated Pd-NP size of 2.0 ± 0.6 nm), whereas stereocomplexes bearing ben-zyl and carboxylic acid end groups exhibited strong Pd-NPs aggregation. The heterogenous catalysts were employed to chemoselectively hydrogenate the C@C double bond in cinnamaldehyde, showing for Pd-NPs, stabilized by the 2,2 0-bipyridine-modified polymer support, the best performance in terms of chemoselectivity (99%) and recyclability in THF solution. Even under bulk cinnamaldehyde hydrogena-tion conditions, chemoselectivity for 3-phenylpropanal of 90% at 88% conversion was obtained.File | Dimensione | Formato | |
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