Conjugate selectivity model

Randid M, Nikolid S, Trinajstic N (1987) The conjugated circuit model on the selection of parameters for computing the resonance energies. In King RB, Rouvray DH (eds) Graph theory and topology in chemistry. Elsevier, Amsterdam, pp 429 147... 

The role of disorder in the photophysics of conjugated polymers has been extensively described by the work carried out in Marburg by H. Bassler and coworkers. Based on ultrafast photoluminescence (PL) (15], field-induced luminescence quenching [16J and site-selective PL excitation [17], a model for excited state thermalizalion was proposed, which considers interchain exciton migration within the inhomogenously broadened density of states. We will base part of the interpretation of our results in m-LPPP on this model, which will be discussed in some detail in Sections 8.4 and 8.6. 

With glyceraldehyde-derived enones and enoates, it has been found that addition of aryl or alkenyl copper reagents is almost independent of the enone geometry [24, 25]. In agreement with the modified Felkin-Anh model, Z enoates usually provide high levels of anti selectivity (Scheme 6.11). Hence, the Z derivative 64 reacted with complete stereochemical control, whereas the -enoate 64 gave a lower selectivity of 4 1 in favor of the anti-conjugate adduct [25]. 

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