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AbstractThe first examples of a π‐conjugated benzo[b]phosphole P‐oxide in which two phosphole P‐oxide units are connected by a carbon‐carbon double bond are described. The molecules are synthesized as E isomers with respect to the carbon‐carbon double bond and exist as stable cis and trans isomers (chiral and meso one respectively) relatively to the two stereogenic P atoms. The optical and electrochemical properties of both isomers have been investigated by experiment and computations.