Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 696, Issue 3, Pages 722-730Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2010.09.054
Keywords
Dendrimers; Hydrogenations; Organometallic catalysis; Rhodium
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Funding
- Department of Science and Technology, New Delhi
- Council of Scientific and Industrial Research, New Delhi
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In order to study the efficiencies of catalytic moieties within and across dendrimer generations, partially and fully functionalized dendrimers were synthesized. Poly(alkyl aryl ether) dendrimers from zero to three generations, presenting 3 to 24 peripheral functionalities, were utilized to prepare as many as 12 catalysts. The dendrimer peripheries were partially and fully functionalized with triphenylphosphine in the first instance. A rhodium(I) metal complexation was performed subsequently to afford multivalent dendritic catalysts, both within and across generations. Upon synthesis, the dendritic catalysts were tested in the hydrogenation of styrene, in a substrate-to-catalyst ratio of 1:0.001. Turn-over-numbers were evaluated for each catalyst, from which significant increases in the catalytic activities were identified for multivalent catalysts than monovalent catalysts, both within and across generations. (C) 2010 Elsevier B.V. All rights reserved.
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