An Unprecedented “Reverse” 1,2-Migration of a Nitro Group within an α-Aryl-β-nitroethenyl Moiety Driven by Steric and Stereoelectronic Effects

The release of repulsive interactions of steric and/or stereoelectronic nature and the onset of a new extended and effective conjugation concur to an unprecedented and synthetically appealing shift of a nitro group from the β- to the α-position with respect to the aryl group of a styrene moiety.