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Matthias Dries - One of the best experts on this subject based on the ideXlab platform.

  • Formamidines versatile ligands for zinc catalyzed hydrosilylation and iron catalyzed epoxidation reactions
    European Journal of Organic Chemistry, 2010
    Co-Authors: Stephan Enthaler, Kristin Schroder, Shigeyoshi Inoue, Bjorn Eckhardt, Kathrin Junge, Matthias Beller, Matthias Dries
    Abstract:

    In the present study the abilities of catalysts modified by formamidine ligands have been examined in the zinc-catalyzed hydrosilylation of ketones and the iron-catalyzed epoxidation of stilbene. In case of hydrosilylation diethylzinc combined with easily accessible formamidine ligands allow for the efficient reduction of various aryl and alkyl ketones. By using a convenient in situ catalyst system high turnover frequencies up to more than 1.000 h ―1 and a broad functional group tolerance were achieved. Moreover, the formamidine ligands were successfully applied in the iron-catalyzed epoxidation of stilbene with hydrogen peroxide in good yield and chemoselectivity.

Stephan Enthaler - One of the best experts on this subject based on the ideXlab platform.

  • Formamidines versatile ligands for zinc catalyzed hydrosilylation and iron catalyzed epoxidation reactions
    ChemInform, 2011
    Co-Authors: Stephan Enthaler, Shigeyoshi Inoue, Kathrin Junge, Matthias Beller, Kristin Schroeder, Bjoern Eckhardt, Matthias Drieß
    Abstract:

    Formamidine ligands, e.g. (I), are successfully applied in the Zn-catalyzed hydrosilylation—hydrolysis reaction of a diversity of aromatic and aliphatic ketones [cf.

  • Formamidines versatile ligands for zinc catalyzed hydrosilylation and iron catalyzed epoxidation reactions
    European Journal of Organic Chemistry, 2010
    Co-Authors: Stephan Enthaler, Kristin Schroder, Shigeyoshi Inoue, Bjorn Eckhardt, Kathrin Junge, Matthias Beller, Matthias Dries
    Abstract:

    In the present study the abilities of catalysts modified by formamidine ligands have been examined in the zinc-catalyzed hydrosilylation of ketones and the iron-catalyzed epoxidation of stilbene. In case of hydrosilylation diethylzinc combined with easily accessible formamidine ligands allow for the efficient reduction of various aryl and alkyl ketones. By using a convenient in situ catalyst system high turnover frequencies up to more than 1.000 h ―1 and a broad functional group tolerance were achieved. Moreover, the formamidine ligands were successfully applied in the iron-catalyzed epoxidation of stilbene with hydrogen peroxide in good yield and chemoselectivity.

  • Formamidines – Versatile Ligands for Zinc-Catalyzed Hydrosilylation and Iron-Catalyzed Epoxidation Reactions
    European Journal of Organic Chemistry, 2010
    Co-Authors: Stephan Enthaler, Kristin Schroder, Shigeyoshi Inoue, Bjorn Eckhardt, Kathrin Junge, Matthias Beller, Matthias Drieß
    Abstract:

    In the present study the abilities of catalysts modified by formamidine ligands have been examined in the zinc-catalyzed hydrosilylation of ketones and the iron-catalyzed epoxidation of stilbene. In case of hydrosilylation diethylzinc combined with easily accessible formamidine ligands allow for the efficient reduction of various aryl and alkyl ketones. By using a convenient in situ catalyst system high turnover frequencies up to more than 1.000 h ―1 and a broad functional group tolerance were achieved. Moreover, the formamidine ligands were successfully applied in the iron-catalyzed epoxidation of stilbene with hydrogen peroxide in good yield and chemoselectivity.

Mohamed Ahmed Ibrahim Ahmed - One of the best experts on this subject based on the ideXlab platform.

  • unique biochemical and molecular biological mechanism of synergistic actions of formamidine compounds on selected pyrethroid and neonicotinoid insecticides on the fourth instar larvae of aedes aegypti diptera culicidae
    Pesticide Biochemistry and Physiology, 2015
    Co-Authors: Christoph F A Vogel, Mohamed Ahmed Ibrahim Ahmed, Fumio Matsumura
    Abstract:

    Abstract We recently reported that formamidine pesticides such as amitraz and chlordimeform effectively synergize toxic actions of certain pyrethroid and neonicotinoid insecticides in some insect species on the 4th instar larvae of Aedes aegypti. Here we studied the biochemical basis of the synergistic actions of the Formamidines in amplifying the toxicity of neonicotinoids and pyrethroids such as dinotefuran and thiamethoxam, as well as deltamethrin-fenvalerate type of pyrethroids. We tested the hypothesis that their synergistic actions are mediated by the octopamine receptor, and that the major consequence of octopamine receptor activation is induction of trehalase to increase glucose levels in the hemolymph. The results show that Formamidines cause a significant up-regulation of the octopamine receptor and trehalase mRNA expressions. Furthermore, Formamidines significantly elevate levels of free glucose when co-treated with dinotefuran, deltamethrin and fenvalerate, but not with permethrin or fenitrothion, which showed no synergistic toxic effects with Formamidines. These results support the conclusion that the main mode of synergism is based on the ability to activate the octopamine receptor, which is particularly effective with insecticides causing hyperexcitation-induced glucose release and consequently leading to quick energy exhaustion.

  • Synergistic actions of formamidine insecticides on the activity of pyrethroids and neonicotinoids against Aedes aegypti (Diptera: Culicidae).
    Journal of Medical Entomology, 2012
    Co-Authors: Mohamed Ahmed Ibrahim Ahmed, Fumio Matsumura
    Abstract:

    Formamidines are unique insecticides and acaricides that elicit multiple effects in controlling insects. Here, we tested two Formamidines, amitraz, and chlordimeform, for their synergistic actions on type II pyrethroids and neonicotinoids to increase their larvicidal actions on the fourth instars of Aedes aegypti L. An organophosphate insecticide was used as a negative control. After 24 h, the synergism of Formamidines was highest on imidacloprid, followed by two type II pyrethroids, deltamethrin and fenvalerate. After 48 h, the synergism of Formamidines on imidacloprid decreased, remained unchanged on type II pyrethroids, and increased noticeably on two of the newer type neonicotinoids, dinotefuran and thiamethoxam. By 72 h, synergism of Formamidines on dinotefuran reached the maximum, while that on imidacloprid was at a minimum. Both Formamidines did not show synergistic effects on permethrin or fenitrothion. In all cases, the synergistic effects of amitraz on the two major classes of larvicides were greater than for chlordimeform. These results indicate that amitraz is a promising synergist that shows the potential to increase the efficacy of certain members of type II pyrethroids as well as neonicotinoids to control Ae. aegypti larvae.

Shigeyoshi Inoue - One of the best experts on this subject based on the ideXlab platform.

  • Formamidines versatile ligands for zinc catalyzed hydrosilylation and iron catalyzed epoxidation reactions
    ChemInform, 2011
    Co-Authors: Stephan Enthaler, Shigeyoshi Inoue, Kathrin Junge, Matthias Beller, Kristin Schroeder, Bjoern Eckhardt, Matthias Drieß
    Abstract:

    Formamidine ligands, e.g. (I), are successfully applied in the Zn-catalyzed hydrosilylation—hydrolysis reaction of a diversity of aromatic and aliphatic ketones [cf.

  • Formamidines versatile ligands for zinc catalyzed hydrosilylation and iron catalyzed epoxidation reactions
    European Journal of Organic Chemistry, 2010
    Co-Authors: Stephan Enthaler, Kristin Schroder, Shigeyoshi Inoue, Bjorn Eckhardt, Kathrin Junge, Matthias Beller, Matthias Dries
    Abstract:

    In the present study the abilities of catalysts modified by formamidine ligands have been examined in the zinc-catalyzed hydrosilylation of ketones and the iron-catalyzed epoxidation of stilbene. In case of hydrosilylation diethylzinc combined with easily accessible formamidine ligands allow for the efficient reduction of various aryl and alkyl ketones. By using a convenient in situ catalyst system high turnover frequencies up to more than 1.000 h ―1 and a broad functional group tolerance were achieved. Moreover, the formamidine ligands were successfully applied in the iron-catalyzed epoxidation of stilbene with hydrogen peroxide in good yield and chemoselectivity.

  • Formamidines – Versatile Ligands for Zinc-Catalyzed Hydrosilylation and Iron-Catalyzed Epoxidation Reactions
    European Journal of Organic Chemistry, 2010
    Co-Authors: Stephan Enthaler, Kristin Schroder, Shigeyoshi Inoue, Bjorn Eckhardt, Kathrin Junge, Matthias Beller, Matthias Drieß
    Abstract:

    In the present study the abilities of catalysts modified by formamidine ligands have been examined in the zinc-catalyzed hydrosilylation of ketones and the iron-catalyzed epoxidation of stilbene. In case of hydrosilylation diethylzinc combined with easily accessible formamidine ligands allow for the efficient reduction of various aryl and alkyl ketones. By using a convenient in situ catalyst system high turnover frequencies up to more than 1.000 h ―1 and a broad functional group tolerance were achieved. Moreover, the formamidine ligands were successfully applied in the iron-catalyzed epoxidation of stilbene with hydrogen peroxide in good yield and chemoselectivity.

Kathrin Junge - One of the best experts on this subject based on the ideXlab platform.

  • Formamidines versatile ligands for zinc catalyzed hydrosilylation and iron catalyzed epoxidation reactions
    ChemInform, 2011
    Co-Authors: Stephan Enthaler, Shigeyoshi Inoue, Kathrin Junge, Matthias Beller, Kristin Schroeder, Bjoern Eckhardt, Matthias Drieß
    Abstract:

    Formamidine ligands, e.g. (I), are successfully applied in the Zn-catalyzed hydrosilylation—hydrolysis reaction of a diversity of aromatic and aliphatic ketones [cf.

  • Formamidines versatile ligands for zinc catalyzed hydrosilylation and iron catalyzed epoxidation reactions
    European Journal of Organic Chemistry, 2010
    Co-Authors: Stephan Enthaler, Kristin Schroder, Shigeyoshi Inoue, Bjorn Eckhardt, Kathrin Junge, Matthias Beller, Matthias Dries
    Abstract:

    In the present study the abilities of catalysts modified by formamidine ligands have been examined in the zinc-catalyzed hydrosilylation of ketones and the iron-catalyzed epoxidation of stilbene. In case of hydrosilylation diethylzinc combined with easily accessible formamidine ligands allow for the efficient reduction of various aryl and alkyl ketones. By using a convenient in situ catalyst system high turnover frequencies up to more than 1.000 h ―1 and a broad functional group tolerance were achieved. Moreover, the formamidine ligands were successfully applied in the iron-catalyzed epoxidation of stilbene with hydrogen peroxide in good yield and chemoselectivity.

  • Formamidines – Versatile Ligands for Zinc-Catalyzed Hydrosilylation and Iron-Catalyzed Epoxidation Reactions
    European Journal of Organic Chemistry, 2010
    Co-Authors: Stephan Enthaler, Kristin Schroder, Shigeyoshi Inoue, Bjorn Eckhardt, Kathrin Junge, Matthias Beller, Matthias Drieß
    Abstract:

    In the present study the abilities of catalysts modified by formamidine ligands have been examined in the zinc-catalyzed hydrosilylation of ketones and the iron-catalyzed epoxidation of stilbene. In case of hydrosilylation diethylzinc combined with easily accessible formamidine ligands allow for the efficient reduction of various aryl and alkyl ketones. By using a convenient in situ catalyst system high turnover frequencies up to more than 1.000 h ―1 and a broad functional group tolerance were achieved. Moreover, the formamidine ligands were successfully applied in the iron-catalyzed epoxidation of stilbene with hydrogen peroxide in good yield and chemoselectivity.