Cascade carbopalladation reaction between alkynes and gem-dibromoolefins: facile access to monoannelated pentalenes.

A carbopalladation cascade reaction of easily accessible gem-dibromoolefins and alkynes furnishes monobenzo- and mononaphthopentalenes. The new chromophores accessed by this short route exhibit small HOMO-LUMO gaps and redox amphoteric behavior with tunable redox potentials.

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