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n-butyllithium in diethyl ether; hexane (Ar), ligand in diethyl ether cooled to -78°C, slowly treated with n-BuLi in hexane for 10 min, kept for 1.5 h with stirring, treated with Sn complex for 5 min, cooled at -78°C for 120 min; warmed to room temp. overnight, filtered, evapd.(vac.);