Hydrogen atom transfer summary

In summary, the electron transfer chain consists of a series of membrane-bound enzymes that possess different prosthetic groups which become alternately reduced and oxidised as they transfer electrons (or hydrogen atoms), from one carrier to the next in sequence, to oxygen to produce H2O. 

Figure 9.5 A summary of pathways of the three main fueb and the positions where they enter the cycle. The figure also shows the release of hydrogen atoms/electrons and their transfer into the electron transfer chain for generation of ATP and formation of water. Glutamine is converted to glutamate by deamidation and glutamate is converted to oxoglutarate by transamination or deamination. The process of glycolysis also generates ATP as shown in the Figure.

In summary, the triplet (do po) excited states of the d -d metal dimers [Ir(p-pz)(C0D)]2 and Pt2(pop)4 " undergo a variety of photochemical reactions. Electron transfer to one-electron quenchers such as pyridinium cations or halocarbons readily occurs with acceptors that have reduction potentials as negative as -2.0 V. With the latter reagents, net two-electron, photoinduced electron transfer yields d -d oxidative addition products. Additionally, the triplet (da pa) excited state of Pt2(pop)4 apparently is able to react by extracting a hydrogen atom from a C-H bond of an organic substrate. 

A summary of the reactions of the /1-oxidation of saturated fatty acids is shown in Figure 12.6. The pathway begins with an oxidation-reduction reaction, catalyzed by acyl-CoA dehydrogenase (an inner mitochondrial membrane flavo-protein), in which one hydrogen atom each is removed from the a- and /1-carbons and transferred to the enzyme-bound FAD ... 

Summary of absolute rate coefficients and parameters for H-atom transfer to f-BuO-at 40°C (per active hydrogen). 

Summary BusSnH is an effective reagent for partial conversion of Si-Cl into Si-H groups. The hydrogenation mechanism postulates the coordination of the catalyst or the solvent to silicon giving a hypervalent intermediate in the first step, followed by the attack of tributyltin hydride by a single electron transfer or a synchronous hydride transfer. This mechanism implies that the intermediate containing a hypervalent silicon atom reacts faster than the starting tetracoordinate silane. 

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