Abstract
The σ,π-mixing responsible for the Z,Z configuration of the title compounds is indifferent to both withdrawing (NO2) and releasing (OMe) π-electron character of ortho-substituents, and the arrangement of aromatic rings in the Z,E configuration orthogonally to the NSN plane is a universal way to overcome steric hindrances due to bulky (But, Br) ortho-substituents.
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