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Issue 11, 2016
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Syntheses and catalytic activities of new metallodendritic catalysts

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Abstract

This investigation presents the syntheses of new metallodendritic catalysts from a silsesquioxane core (Silsesq-PrNH3+Cl) via a new route. For optimization of the syntheses of the catalysts, reaction times, thermodynamic effects, and the amounts of [Mo(η3-C3H5)Br(CO)2(NCCH3)2] (1) and [Mo(CO)3Br2(NCCH3)2] (2) complexes fixed on the second-generation dendrimer (PDG2.0) were studied. After the optimization studies and with the objective of application in catalysis, the catalysts were prepared by reaction of PDG2.0 with the organometallic complexes and characterized by elemental analysis (CNH), FTIR, 13C and 29Si NMR, XRD, TGA, SEM, EDS and BET. The metallodendritic catalysts were tested in the epoxidation of olefins and shown to be a vigorous catalyst with conversion rates between 76 and 97% for PDG2.0–[(Mo(η3-C3H5)(CO)2Br)8] and 30–80% for PDG2.0–[(Mo(CO)3Br2)5], and a high selectivity in the formation of epoxides using tertbutyl hydroperoxide (TBHP) as an oxidant. The catalysts remain highly active after being used for at least 5 cycles. To the best of our knowledge, this study is the first to have reported the preparation of these new dendritic catalysts, as well as the catalytic comparison with their previous generations in the epoxidation of 1-octene, cyclooctene, (S)-limonene, cis-3-hexen-1-ol, trans-3-hexen-1-ol and styrene.

Graphical abstract: Syntheses and catalytic activities of new metallodendritic catalysts

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Publication details

The article was received on 23 May 2016, accepted on 12 Sep 2016 and first published on 13 Sep 2016


Article type: Paper
DOI: 10.1039/C6NJ01629D
Citation: New J. Chem., 2016,40, 9403-9414
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    Syntheses and catalytic activities of new metallodendritic catalysts

    E. G. Vieira, R. O. Silva, A. G. Dal-Bó, T. E. A. Frizon and N. L. D. Filho, New J. Chem., 2016, 40, 9403
    DOI: 10.1039/C6NJ01629D

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