The stable bis(2,4,6-triisopropylphenyl)(supermesityl)stannaphosphene 1(supermesityl : 2,4,6-tri-tert-butylphenyl) has been synthesized by dehydrofluorination of the corresponding fluorostannylphosphine by tert-butyllithium; its structure has been evidenced by NMR spectroscopy and by addition of methanol and water onto the tin–phosphorusdoublebond.