The lesser electron withdrawing via induction may let the resonance effect govern the chemical shifts of C(2–5), so that a downfield chemical shift of C(3,4) and an upfield chemical shift of C(2,5) may result. It would help confirm the hypothesis we proposed earlier. Further, while ...
The extension of the pi delocalization system in the Azo1 to Azo4 series is schematized using resonance structures in Figure S25 (in Supplementary Materials). Figure 6. Molecular surfaces and energies for the HOMO and LUMO frontier orbitals in the gas phase molecules Azo1 to Azo4, calculated...