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      New Isopropylmaltol - Ti Synthesis and its Use as a Catalyst for Olefin Polymerization

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          Abstract

          This report describes a new synthesis of isopropylmaltol from furfural. This organic compound was used as ligand to obtain a new complex, the dichlorobis-(3-hydroxy-2-isopropyl-4-pyrone) titanium(IV). 1H nuclear magnetic ressonance, elemental analysis and UV-Vis analysis confirm the complex formation. This complex was investigated in ethylene polymerization using methylaluminoxane (MAO) as cocatalyst. The catalytic activity was low, however, there were obtained very high molecular weight polyethylenes, which are interesting for various special applications.

          Translated abstract

          Este artigo mostra a síntese e caracterização do ligante isopropilmaltol obtido a partir do furfural e também um novo complexo diclorobis-(3-hidroxi-2-isopropil-4-pirona)titânio(IV) com estrutura cis. Dados de ressonância magnética nuclear de 1H, análise elementar e UV-Vis confirmam a formação do complexo. Este complexo foi estudado em reações de polimerização de etileno utilizando metilaluminoxano (MAO) como co-catalisador. A atividade catalítica deste complexo é baixa, entretanto foram obtidos polietilenos com alto peso molecular que são interessantes para diferentes aplicações.

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          Diphenyl phosphate/4-dimethylaminopyridine as an efficient binary organocatalyst system for controlled/living ring-opening polymerization ofL-lactide leading to diblock and end-functionalized poly(L-lactide)s

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            1-Isothiocyanatosilatrane derived from trisisopropanolamine: Synthesis, characterization, reactivity and theoretical studies

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              Zinc, cadmium, and mercury complexes with fluorinated selenolate ligands.

              Reductive cleavage of C(6)F(5)SeSeC(6)F(5) with elemental M (M = Zn, Cd, and Hg) in pyridine results in the formation of (py)(2)Zn(SeC(6)F(5))(2), (py)(2)Cd(SeC(6)F(5))(2), and Hg(SeC(6)F(5))(2). Structural characterization of the Zn and Cd compounds reveals tetrahedral coordination environments, while the Hg compound shows a complicated series of linear structures with two short, nearly linear Hg-Se bonds, up to two longer and perpendicular Hg...Se interactions, and no coordinated pyridine ligands. All three compounds exhibit well-defined intermolecular pi-pi-stacking interactions in the solid state. They are volatile and decompose at elevated temperatures to give MSe and either (SeC(6)F(5))(2) or Se(C(6)F(5))(2).
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                jbchs
                Journal of the Brazilian Chemical Society
                J. Braz. Chem. Soc.
                Sociedade Brasileira de Química (São Paulo, SP, Brazil )
                0103-5053
                1678-4790
                December 2014
                : 25
                : 12
                : 2258-2265
                Affiliations
                [02] Porto Alegre Rio Grande do Sul orgnamePontifícia Universidade Católica do Rio Grande do Sul orgdiv1Faculdade de Química Brazil
                [01] Porto Alegre Rio Grande do Sul orgnameUniversidade Federal do Rio Grande do Sul orgdiv1Instituto de Química Brazil
                Article
                S0103-50532014001202258
                10.5935/0103-5053.20140192
                0c5aef0f-7c68-45a5-bf74-193ea7587458

                This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 International License.

                History
                : 09 June 2014
                : 15 August 2014
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 20, Pages: 8
                Product

                SciELO Brazil

                Categories
                Articles

                synthesis,complex,isopropylpyrone,polymerization,polyethylene

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