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Non-carbene Complex [RuCl2(PPh3)2(azocane)] as Active Catalyst Precursor for ROMP and ATRP

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Abstract

The novel, non-carbene complex [RuCl2(PPh3)2(azocane)] (1) of trigonal bipyramid geometry was synthesized, characterized (CHN elementary analysis, FTIR, EPR, and 31P NMR), and applied as catalyst precursor for ring opening metathesis polymerization (ROMP) and atom transfer radical polymerization (ATRP). ROMP of norbornene (NBE) resulted in 70% yield at 50 °C in 60 min, with [NBE]/[1] = 5000, and 15% yield from ROMP of norbornadiene was obtained under the same conditions. ATRP of methyl methacrylate (MMA) resulted in ca. 20% conversion at 85 °C in 9 h, with [MMA]/[1] = 1000, and increased to ca. 50% in the presence of Al(OiPr)3, with narrower PDI values. With [MMA]/[1] = 200, ca. 50% yield was obtained at 85 °C in 6 h either in the absence or presence of Al(OiPr)3. ATRP of styrene resulted in 9 and 16% conversion at 110 °C in 7 h in the absence or presence of Al(OiPr)3, respectively, with [St]/[1] = 1000. Results are discussed considering the five-coordinated molecular geometry of the starting complex and the arrangements required in ROMP and ATRP to initiate the reactions.

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Acknowledgements

The authors are indebted to the financial support from CAPES, CNPq, and FAPESP (Process numbers: 2013/10002-0, 2011/12571-7 and 06/57577-4).

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Authors and Affiliations

  1. Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista, Presidente Prudente, SP, 19060-900, Brazil

    Rodolpho A. N. Silva, Patrícia Borim & Valdemiro P. Carvalho-Jr

  2. Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, 13560-970, Brazil

    Patrícia Borim, Larissa R. Fonseca & Benedito S. Lima-Neto

  3. Centro de Ciências da Natureza, Universidade Estadual do Piauí, Teresina, PI, 64002-150, Brazil

    José L. Silva Sá

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  1. Rodolpho A. N. Silva
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  2. Patrícia Borim
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  3. Larissa R. Fonseca
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  4. Benedito S. Lima-Neto
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  5. José L. Silva Sá
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  6. Valdemiro P. Carvalho-Jr
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Correspondence to Valdemiro P. Carvalho-Jr.

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Silva, R.A.N., Borim, P., Fonseca, L.R. et al. Non-carbene Complex [RuCl2(PPh3)2(azocane)] as Active Catalyst Precursor for ROMP and ATRP. Catal Lett 147, 1144–1152 (2017). https://doi.org/10.1007/s10562-017-2003-y

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