Interacting fragments, biphenyl and

Figure 4.16. Derivation of the correlation diagram for the concerted fragmentation of cyclobutenophenanthrene from the orbital energy-level scheme of biphenyl and the orbital correlation diagram for the fragmentation of cyclobutane into two ethylenes. (The additional double bond has been neglected in the simplified treatment.) The arrows indicate the magnitude of orbital interactions between the two superimposed systems (by permission from Michl, 1974b).

Table 14.5 Transition energy A (in eV), osdUator strength (in parentheses), collectivity number K, excitation distribution La, CT numbers (14.37) for intra-fragment (/i = h->-]) and interfragment (/i- ii) interactions, and CT,ot (in %) in the lowest p-transitions of biphenyl...

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