Synthesis and studies of Rh(I) catalysts within and across poly(alkyl aryl ether) dendrimers |
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Authors: | Baskar Natarajan |
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Institution: | Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India |
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Abstract: | 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. |
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Keywords: | Dendrimers Hydrogenations Organometallic catalysis Rhodium |
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