in pentane byproducts: LiI; (Ar); dropwise addn. of Sn-compd. in pentane to suspn. of org. compd. in pentane (-15-(-)10°C), heating (10 min), standing (overnight), pptn.; decantation (under Ar), degassing (vac.), washing ppt. with pentane, combining with soln., pentane removal, distn. (vac.); elem. anal.;

in diethyl ether; pentane byproducts: butane, MgBrI; (inert atmosphere); slow dropwise addn. of excess of Et2NH to soln. of BuMgBr in ether (-10°C), pptn., warming to room temp., refluxing (20 min), cooling to -15°C, dropwise addn. of Sn-compd. in pentane, heating (1 h), standing (overnight); decanting (under Ar), solvent evapn., distn. (vac.); elem. anal.;