in tetrahydrofuran Ph3SnCl was added to a soln. of Yb-contg. compd. in THF (molar ratio 2:1); the mixt. was allowed to stand for a day at room temp.; the yellow solid was vac. dried for 1 h; the react. was carried out in evacuated sealed ampules; the solvent was vac. evapd., and the residue was treated with hexane; from the combined hexane exts. the solvent was evapd. and Ph3SnCCPh was obtained; elem. anal.;