in tetrahydrofuran react. under Ar or N2 (vac. line and Schlenk tube); addn. of Sn-compd. in THF to a slurry of dilithio reagent in THF, stirring at room temp. for 5 h (ppt.); hydrolysis with satd. NH4Cl soln, extn. with CHCl3, drying of organic phase (MgSO4), evapn. (vac.), recrystn. from CHCl3-ether (50:50); elem. anal.;

in pentane (Ar); using Schlenk techniques; cooling of soln. of ((C5H5)Fe(C5H4)CHC)RhF(P(i-Pr)3)2 in pentane at -30°C; treatment with Ph3SnC4SnPh3 (0.5 equiv.); slowly warming to room temp., stirring for 1.5 h; pptn., filtration, evapn. to dryness in vac., dissolving in acetone, crystn. at -60°C for 15 h, sepn. from mother liquor, washing twice with acetone (-20°C); drying, elem. anal.;