Optically active amphiphilic hyperbranched polyglycerols as templates for palladium nanoparticles |
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Authors: | Yu Chen Holger Frey Ralf Thomann |
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Affiliation: | a Department of Chemistry,Tianjin University, 300072 Tianjin, PR China b Institut für Organische Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, 55099 Mainz, Germany c Institut für Makromolekulare Chemie und Freiburger Materialforschungszentrum FMF Albert-Ludwigs-Universität Freiburg, Stefan-Meier Str. 21/31, D-79104 Freiburg, Germany d Instituto de Ciencia Molecular, Universidad de Valencia, Vicent Andrés Estellés s/n, Burjassot, 46100 Valencia, Spain |
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Abstract: | We report a systematic study on the encapsulation of palladium nanoparticles in optically active amphiphilic hyperbranched polyglycerols with different optical signs and different degrees of polymerization, namely (−)-P(G40C160.5) 1 and (+)-P(G73C160.5) 2. Several issues have been addressed here: (a) relatively wide size distributions (1-5 nm) of palladium nanoparticles have been achieved, (b) a remarkable template effect (1, DPn = 40, 1.2 ± 0.1 nm; 2, DPn = 73, 2.3 ± 0.1 nm average particle size) has been observed using TEM technique, as shown by the particle size dependent on the degree of polymerization of the polymers, (c) NaBH4 is found to be a convenient reducing agent to produce small particle size compared with gaseous hydrogen, (d) catalytic Heck reaction of 2,3-dihydrofuran and aryl triflate has been tested successfully without enantiocontrol. |
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Keywords: | Chiral hyperbranched Core-shell structure Palladium Nanoparticles Catalysis |
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