Special Topic 6.10 Cyclopropyl group as a mechanistic probe

Special Topic 6.10 Cyclopropyl group as a mechanistic probe 

Case Study 6.14 Synthesis of cage compounds - octahedrane 

Case Study 6.15 Mechanistic photochemistry - regioseiectivity of photosubstitution 

Explain the following concepts and keywords phototransposition photo-ring contraction meta-photocycloaddition photosubstitution photo-NOCAS. 

Carbonyl compounds also have two nonbonding lone pairs on the oxygen atom. In organic chemistry texts, these are sometimes shown as two equivalent sp2-hybridized lobes (rabbit s ears). While hybridization has no effect on the total energy, the two degenerate nsp2 orbitals are inappropriate as a basis set to discuss one-electron properties such as ionization potentials or n,jt transitions. Rather, the symmetry-adapted lone pairs 

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