Size-controlled palladium nanoparticle catalysts using dendron assembly for semihydrogenation and one-pot synthesis

ORGN 733

Makoto Murata, murata@cheng.es.osaka-u.ac.jp, Yuko Tanaka, tyuko@cheng.es.osaka-u.ac.jp, Tomoo Mizugaki, mizugaki@cheng.es.osaka-u.ac.jp, Kohki Ebitani, ebitani@cheng.es.osaka-u.ac.jp, and Kiyotomi Kaneda, kaneda@cheng.es.osaka-u.ac.jp. Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
We developed a new approach for size control of Pd(0) nanoparticles via self-assembly of dendrons, which was applied to a nanoreactor. The dendritic Pd nanoparticles [Gn Py-Cm Pd(0); n = 1, 2, 3, m = 6, 12] were prepared by treatment of the dendrons consisting of pyridyl core and alkyl end group with [PdCl(C3H5)]2 in CH2Cl2, followed by reduction with LiB(C2H5)3H. The Pd nanoparticle sizes were controllable by changing the generation and the surface alkyl groups of the dendrons. Gn Py-Cm Pd(0) catalyzed semihydrogenation of dienes and alkynes to monoenes, and hydrogen bond-assisted substrate-specific hydrogenation of alkynes. Furthermore, one-pot synthesis of an intermediate of glutarimide was accomplished through cooperative catalyses of the skeletal amino groups and Pd species within the dendron assembly

 

Asymmetric Reactions, Molecular Recognition, Self Assembly, Bioorganic Chemistry, Process R&D
8:00 PM-10:00 PM, Wednesday, 16 March 2005 Convention Center -- Hall D, Poster

Division of Organic Chemistry

The 229th ACS National Meeting, in San Diego, CA, March 13-17, 2005