Oxidatively induced reductive elimination. A novel titanium complex resulting from C–F bond activation

1990 ◽  
pp. 809-810 ◽  
Author(s):  
Mark J. Burk ◽  
Donna L. Staley ◽  
William Tumas
Keyword(s):  
Bond Activation ◽  
Reductive Elimination ◽  
Titanium Complex

Reversible Oxidative-Addition and Reductive-Elimination of Thiophene from a Titanium Complex and Its Thermally-Induced Hydrodesulfurization Chemistry

2019 ◽  
Author(s):  
Alejandra Gomez-Torres ◽  
J. Rolando Aguilar-Calderón ◽  
Carlos Saucedo ◽  
Aldo Jordan ◽  
Alejandro J. Metta-Magaña ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Ring Opening ◽  
Thiophene Ring ◽  
Oxidative Addition ◽  
Reductive Elimination ◽  
Thermally Induced ◽  
Titanium Complex

<p>The masked Ti(II) synthon (<sup>Ket</sup>guan)(<i>η</i><sup>6</sup>-Im<sup>Dipp</sup>N)Ti (<b>1</b>) oxidatively adds across thiophene to give ring-opened (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti[<i>κ</i><sup>2</sup>-<i>S</i>(CH)<sub>3</sub><i>C</i>H] (<b>2</b>). Complex <b>2</b> is photosensitive, and upon exposure to light, reductively eliminates thiophene to regenerate <b>1</b> – a rare example of early-metal mediated oxidative-addition/reductive-elimination chemistry. DFT calculations indicate strong titanium π-backdonation to the thiophene π*-orbitals leads to the observed thiophene ring opening across titanium, while a proposed photoinduced LMCT promotes the reverse thiophene elimination from <b>2</b>. Finally, pressurizing solutions of <b>2 </b>with H<sub>2</sub> (150 psi) at 80 °C leads to the hydrodesulfurization of thiophene to give the Ti(IV) sulfide (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti(S) (<b>3</b>) and butane. </p>

scholarly journals DFT Study of Unstrained Ketone C-C Bond Activation via Rhodium(I)-Catalyzed Suzuki-Miyaura Cross-Coupling Reactions

2019 ◽  
Author(s):  
Dengmengfei Xiao ◽  
Lili Zhao ◽  
Diego Andrada
Keyword(s):  
Density Functional ◽  
Bond Activation ◽  
Chemical Reactivity ◽  
Cross Coupling ◽  
Underlying Mechanism ◽  
Reductive Elimination ◽  
Coupling Reactions ◽  
Co Catalysts ◽  
Cross Coupling Reactions ◽  
Strain Model

Unstrained cyclic ketones can participate in cooperative Suzuki-Miyaura cross-coupling type reaction using rhodium(I)-based catalyst via C-C bond activation. The regioselectivity indicates a trend where the most substituted side is activated and it is controlled by the beta-substituents. In this work, Density Functional Theory (DFT) calculations have been carried out to disclose the underlying mechanism in the reaction of a ketone series and arylboronate using ylidene as ancillary ligand and pyridine as co-catalysts. The computed energies suggest the reductive elimination step with the highest energy while the reductive elimination has the highest energy barrier. By the means of the Activation Strain Model (ASM) of chemical reactivity, it is found that the ketone strain energy released on the oxidative addition does not control the relativity of the OA reactivity, but indeed is the interaction energy between Rh(I) and C-C bond the ruling effect. The effect of the beta-substituents on regioselectivity has been additionally studied.

scholarly journals Electron Redistribution within the Nitrogenase Active Site FeMo-Cofactor During Reductive Elimination of H2 to Achieve N≡N Triple-Bond Activation

2020 ◽  
Vol 142 (52) ◽  
pp. 21679-21690
Author(s):  
Dmitriy A. Lukoyanov ◽  
Zhi-Yong Yang ◽  
Dennis R. Dean ◽  
Lance C. Seefeldt ◽  
Simone Raugei ◽  
...  
Keyword(s):  
Active Site ◽  
Triple Bond ◽  
Bond Activation ◽  
Reductive Elimination ◽  
Femo Cofactor

Reductive Elimination from Cyclometalated Platinum(IV) Complexes To Form Csp2–Csp3 Bonds and Subsequent Competition between Csp2–H and Csp3–H Bond Activation

2012 ◽  
Vol 31 (12) ◽  
pp. 4401-4404 ◽  
Author(s):  
Margarita Crespo ◽  
Craig M. Anderson ◽  
Nicole Kfoury ◽  
Mercè Font-Bardia ◽  
Teresa Calvet
Keyword(s):  
Bond Activation ◽  
Reductive Elimination

Palladium-Catalyzed Annulation via Acyl C–H Bond Activation

Synlett ◽  
2018 ◽  
Vol 29 (16) ◽  
pp. 2087-2092 ◽  
Author(s):  
Gui Chen ◽  
Xueliang Huang ◽  
Yinghua Yu
Keyword(s):  
Bond Activation ◽  
Reductive Elimination ◽  
Straightforward Manner ◽  
Migratory Insertion ◽  
Palladium Catalyzed

Palladium-catalyzed annulation of ortho-bromobenzaldehydes with aryl diazoesters is achieved via a sequence of palladium carbene migratory insertion, acyl C–H bond activation and reductive elimination of a seven-membered palladacyclic intermediate. A variety of isocoumarin derivatives were furnished in a straightforward manner.

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