Friedel transition state model

Figure 11.4 Calculated transition state model of an asymmetric Friedel-Crafts reaction.

Figure 11.6 Proposed transition state model of the Friedel-Crafts reaction of indole.

The first part of the chapter is devoted to an analysis of these correlations, as well as to the presentation of the most important experimental results. In a second part the following stage of development is reviewed, i.e. the introduction of more quantitative theories mostly based on bond structure calculations. These theories are given a thermodynamic form (equation of states at zero temperature), and explain the typical behaviour of such ground state properties as cohesive energies, atomic volumes, and bulk moduli across the series. They employ in their simplest form the Friedel model extended from the d- to the 5f-itinerant state. The Mott transition (between plutonium and americium metals) finds a good justification within this frame. 

This in general gives a logarithmic divergence, as shown by Nozieres and De Dominicis, so the transition probability is infinite. The exciton state, if one exists, is of course filled, and this model provides one description of the way the hole is screened (see Friedel 1952a, b). 

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