Superelectrophilic heterocycles: facile S(N)Ar-S(E)Ar couplings involving very weak carbon nucleophiles.
Superelectrophilic halonitro-2,1,3-benzoxadiazoles undergo remarkably facile carbon-carbon couplings with some electron-rich aromatics and heteroaromatics, affording quantitatively products exhibiting an intense visible absorption due to strong intramolecular charge transfer.