The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
John R Sowa - One of the best experts on this subject based on the ideXlab platform.
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what is the Rate of the csp2 csp2 reductive Elimination step revealing an unusually fast ni catalyzed negishi type oxidative coupling reaction
Journal of the American Chemical Society, 2009Co-Authors: Hua Zhang, Peng Li, John R SowaAbstract:For a direct quantitative investigation of the Csp2−Csp2 reductive Elimination Rate within a catalytic cycle, a novel oxidative coupling system in the presence of a Ni catalyst and desyl chloride as the oxidant is devised. The reaction progress profiles of arylzinc reagents exhibit zero-order kinetic behavior, and a reductive Elimination step is confirmed as the Rate-determining step. This allows direct measurement of the Csp2−Csp2 reductive Elimination Rate Constant within a catalytic cycle. The Rate Constants of p-MePhZnCl are obtained in the range 0.23 to 3.5 s−1 from 0 to −35 °C, which are unusually fast reaction Rates. According to the Arrhenius equation, the values of ΔH‡ and ΔS‡ (ΔH‡ = 9.7 kcal mol−1, ΔS‡ = 35 J mol−1 K−1) are obtained. The small value of ΔH‡ reveals that the reductive Elimination step of Csp2−Ni−Csp2 is an extremely facile process.
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what is the Rate of the csp2 csp2 reductive Elimination step revealing an unusually fast ni catalyzed negishi type oxidative coupling reaction
Journal of the American Chemical Society, 2009Co-Authors: Liqun Jin, Hua Zhang, John R Sowa, Aiwen LeiAbstract:For a direct quantitative investigation of the Csp(2)-Csp(2) reductive Elimination Rate within a catalytic cycle, a novel oxidative coupling system in the presence of a Ni catalyst and desyl chloride as the oxidant is devised. The reaction progress profiles of arylzinc reagents exhibit zero-order kinetic behavior, and a reductive Elimination step is confirmed as the Rate-determining step. This allows direct measurement of the Csp(2)-Csp(2) reductive Elimination Rate Constant within a catalytic cycle. The Rate Constants of p-MePhZnCl are obtained in the range 0.23 to 3.5 s(-1) from 0 to -35 degrees C, which are unusually fast reaction Rates. According to the Arrhenius equation, the values of DeltaH(double dagger) and DeltaS(double dagger) (DeltaH(double dagger) = 9.7 kcal mol(-1), DeltaS(double dagger) = 35 J mol(-1) K(-1)) are obtained. The small value of DeltaH(double dagger) reveals that the reductive Elimination step of Csp(2)-Ni-Csp(2) is an extremely facile process.
Hua Zhang - One of the best experts on this subject based on the ideXlab platform.
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what is the Rate of the csp2 csp2 reductive Elimination step revealing an unusually fast ni catalyzed negishi type oxidative coupling reaction
Journal of the American Chemical Society, 2009Co-Authors: Hua Zhang, Peng Li, John R SowaAbstract:For a direct quantitative investigation of the Csp2−Csp2 reductive Elimination Rate within a catalytic cycle, a novel oxidative coupling system in the presence of a Ni catalyst and desyl chloride as the oxidant is devised. The reaction progress profiles of arylzinc reagents exhibit zero-order kinetic behavior, and a reductive Elimination step is confirmed as the Rate-determining step. This allows direct measurement of the Csp2−Csp2 reductive Elimination Rate Constant within a catalytic cycle. The Rate Constants of p-MePhZnCl are obtained in the range 0.23 to 3.5 s−1 from 0 to −35 °C, which are unusually fast reaction Rates. According to the Arrhenius equation, the values of ΔH‡ and ΔS‡ (ΔH‡ = 9.7 kcal mol−1, ΔS‡ = 35 J mol−1 K−1) are obtained. The small value of ΔH‡ reveals that the reductive Elimination step of Csp2−Ni−Csp2 is an extremely facile process.
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what is the Rate of the csp2 csp2 reductive Elimination step revealing an unusually fast ni catalyzed negishi type oxidative coupling reaction
Journal of the American Chemical Society, 2009Co-Authors: Liqun Jin, Hua Zhang, John R Sowa, Aiwen LeiAbstract:For a direct quantitative investigation of the Csp(2)-Csp(2) reductive Elimination Rate within a catalytic cycle, a novel oxidative coupling system in the presence of a Ni catalyst and desyl chloride as the oxidant is devised. The reaction progress profiles of arylzinc reagents exhibit zero-order kinetic behavior, and a reductive Elimination step is confirmed as the Rate-determining step. This allows direct measurement of the Csp(2)-Csp(2) reductive Elimination Rate Constant within a catalytic cycle. The Rate Constants of p-MePhZnCl are obtained in the range 0.23 to 3.5 s(-1) from 0 to -35 degrees C, which are unusually fast reaction Rates. According to the Arrhenius equation, the values of DeltaH(double dagger) and DeltaS(double dagger) (DeltaH(double dagger) = 9.7 kcal mol(-1), DeltaS(double dagger) = 35 J mol(-1) K(-1)) are obtained. The small value of DeltaH(double dagger) reveals that the reductive Elimination step of Csp(2)-Ni-Csp(2) is an extremely facile process.
Aiwen Lei - One of the best experts on this subject based on the ideXlab platform.
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what is the Rate of the csp2 csp2 reductive Elimination step revealing an unusually fast ni catalyzed negishi type oxidative coupling reaction
Journal of the American Chemical Society, 2009Co-Authors: Liqun Jin, Hua Zhang, John R Sowa, Aiwen LeiAbstract:For a direct quantitative investigation of the Csp(2)-Csp(2) reductive Elimination Rate within a catalytic cycle, a novel oxidative coupling system in the presence of a Ni catalyst and desyl chloride as the oxidant is devised. The reaction progress profiles of arylzinc reagents exhibit zero-order kinetic behavior, and a reductive Elimination step is confirmed as the Rate-determining step. This allows direct measurement of the Csp(2)-Csp(2) reductive Elimination Rate Constant within a catalytic cycle. The Rate Constants of p-MePhZnCl are obtained in the range 0.23 to 3.5 s(-1) from 0 to -35 degrees C, which are unusually fast reaction Rates. According to the Arrhenius equation, the values of DeltaH(double dagger) and DeltaS(double dagger) (DeltaH(double dagger) = 9.7 kcal mol(-1), DeltaS(double dagger) = 35 J mol(-1) K(-1)) are obtained. The small value of DeltaH(double dagger) reveals that the reductive Elimination step of Csp(2)-Ni-Csp(2) is an extremely facile process.
Liqun Jin - One of the best experts on this subject based on the ideXlab platform.
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what is the Rate of the csp2 csp2 reductive Elimination step revealing an unusually fast ni catalyzed negishi type oxidative coupling reaction
Journal of the American Chemical Society, 2009Co-Authors: Liqun Jin, Hua Zhang, John R Sowa, Aiwen LeiAbstract:For a direct quantitative investigation of the Csp(2)-Csp(2) reductive Elimination Rate within a catalytic cycle, a novel oxidative coupling system in the presence of a Ni catalyst and desyl chloride as the oxidant is devised. The reaction progress profiles of arylzinc reagents exhibit zero-order kinetic behavior, and a reductive Elimination step is confirmed as the Rate-determining step. This allows direct measurement of the Csp(2)-Csp(2) reductive Elimination Rate Constant within a catalytic cycle. The Rate Constants of p-MePhZnCl are obtained in the range 0.23 to 3.5 s(-1) from 0 to -35 degrees C, which are unusually fast reaction Rates. According to the Arrhenius equation, the values of DeltaH(double dagger) and DeltaS(double dagger) (DeltaH(double dagger) = 9.7 kcal mol(-1), DeltaS(double dagger) = 35 J mol(-1) K(-1)) are obtained. The small value of DeltaH(double dagger) reveals that the reductive Elimination step of Csp(2)-Ni-Csp(2) is an extremely facile process.
Peng Li - One of the best experts on this subject based on the ideXlab platform.
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what is the Rate of the csp2 csp2 reductive Elimination step revealing an unusually fast ni catalyzed negishi type oxidative coupling reaction
Journal of the American Chemical Society, 2009Co-Authors: Hua Zhang, Peng Li, John R SowaAbstract:For a direct quantitative investigation of the Csp2−Csp2 reductive Elimination Rate within a catalytic cycle, a novel oxidative coupling system in the presence of a Ni catalyst and desyl chloride as the oxidant is devised. The reaction progress profiles of arylzinc reagents exhibit zero-order kinetic behavior, and a reductive Elimination step is confirmed as the Rate-determining step. This allows direct measurement of the Csp2−Csp2 reductive Elimination Rate Constant within a catalytic cycle. The Rate Constants of p-MePhZnCl are obtained in the range 0.23 to 3.5 s−1 from 0 to −35 °C, which are unusually fast reaction Rates. According to the Arrhenius equation, the values of ΔH‡ and ΔS‡ (ΔH‡ = 9.7 kcal mol−1, ΔS‡ = 35 J mol−1 K−1) are obtained. The small value of ΔH‡ reveals that the reductive Elimination step of Csp2−Ni−Csp2 is an extremely facile process.