Abstractmagnified imageFor the first time, a mild and efficient procedure was developed for the conjugate addition of α,β‐unsaturated compounds to benzeneselenol providing β‐(phenylseleno)‐substituted compounds (Scheme). The reaction was promoted by β‐cyclodextrin, proceeded in H2O at room temperature, and gave impressive yields (Table). The mechanism of the addition reaction, taking place within the cyclodextrin cavity, was supported by the analysis of the guests and host signals in the 1H‐NMR spectra (Fig. 1).