Reaction diagram

Now let us consider the reverse reaction. We need not draw another reaction diagram, since Figure 8-6 will suffice. Now we are interested in the reaction between CO and NO to produce CO and NO ... 

The reaction in Eq. 39 lo > is really quite easy to understand, although the result seems geometrically impossible if a molecular model is examined. The reaction involves an yn-n state since dienic quenchers are noneffective, and the stereochemistry of the product is well-established. 103> The reaction diagram, Fig. 9, provides the key to under-... 

The activation energy is the amount of energy that the reactants must absorb from the system in order to react. In the reaction diagram, the reactants begin at A. The reactants must absorb the energy from A to B in order to form the activated complex. The energy necessary to achieve this activated complex is the distance from A to B in the diagram and is mathematically the difference (B - A). 

Laviron has studied an especially interesting class of nitro compounds containing a second basic site, e.g. 4-nitropyridine (14)33. Even two-dimensional representations such as those encountered earlier (Schemes 2-4) are inadequate to represent this mechanistically very complex situation. Laviron showed, however, that the electrochemical conversion of 14 to the corresponding ArN(OH)2 species can be satisfactorily explained in terms of a modified so-called bi-cubic diagram (Figure 1). Note that the each of the front and rear planes of the bi-cubic model consists of a seven-component reaction diagram analogous to that of... 

Figure 5.8. Reaction diagram illustrating formation of polyamic acid salt.

Fig. 5 Schematic reaction diagrams for the enzymic systems of Table 2.

F-M] complexes, 181-182t and chiral recognition, 179-180, 183 Ligands, 153 Lipoxygenases, 68-69 reaction diagram, 54/... 

Metal-bound amino acid complexes, 206-209 Metal ions, in biological systems, 153—154 Methylamine dehydrogenase, 69—70 reaction diagram, 54/... 

Figure 36, P-T phase and reaction diagram of carbon as results from Refs. 509 and 510. Solid lines represent equilibrium phase boundaries. The dashed line is the threshold for conversion of hexagonal diamond and both hexagonal and rhombohedral graphite into cubic diamond.

Problem 7.16 How can the stability of an intermediate R in an S l reaction be assessed from its enthalpy-reaction diagram M... 

Problem 8.30 Use an enthalpy-reaction diagram to explain the following observations. Start from the allylic carbocation, the common intermediate. 

Probtom 11.12 (a) Draw enthalpy-reaction diagrams for the first step of electrophilic attack on benzene, toluene (meia and para) and nitrobenzene (meta and para). Assume all ground states have the same energy, (b) Where would the para and meta substitution curves for C HjCI lie on this diagram ... 

Essential reaction equations and mathematical equations with identifying labels Complete pathway diagrams and individual reaction diagrams for all metabolic pathways in the book... 

The reaction diagram of Fig. 14.1 applies to methane oxidation under both flame [423] and flow reactor [146] conditions. At high temperatures and fuel-lean to stoichiometric conditions, the conversion of methane proceeds primarily through the sequence CH4 -> CH3 -> CH2O -> HCO -> CO -> CO2. At lower temperatures or under fuel-rich conditions the reactions of CH3 with O or O2 are less competitive. Under these conditions two CH3 radicals may recombine and feed into the C2 hydrocarbon pool,... 

Figure 16. State and reaction diagram of the system Pr 5 I700 -> IJ, including the...

All of the direct fluorinations reported appear to be addition-elimination processes with solvent involvement (Scheme 42). A study of the mechanism and stereochemistry of uracil and cytosine fluorination using fluorine and acetyl hypofluorite has implicated a radical-cation mechanism (86JOC1466). The effect of acetate ion on the products proved to be important. In its absence both m-isomers (49) and trans-isomers (50) were observed in the reaction mixture, but only 50 [and 5-fluorouracil (51)] in its presence. The process has been rationalized in terms of the reaction diagram shown in Scheme 43. NMR studies have revealed that the acetate from the solution containing acetate ion, rather than the residue from acetyl hypofluorite, binds to the 6-position of uracil to form the intermediates (49 and 50). Acetate is a sufficiently strong base to induce trans-elimination of acetic acid from the cis-isomer (49). 5-Fluorouracil (51) was obtained in 45% yield from these reaction sequences (86CJC424). 

Fig. 2 Energy surface for a two-dimensional reaction diagram. 19.1 kcal/mol is the free energy of activation (saddle point - initial comer). Reproduced with permission from ref. 9.

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