catalyst: Pd bis(dibenzylideneacetone)/P(OC2H5)3 in toluene heating soln. of (CH3)3SnCCH (20 mmol) and (CH3)CH(Sn(CH3)2)4CH(CH3) (10 mmol) in toluene for 15 h at 75°C in presence of palladium bis(dibenzylidene acetone) (3 molpercent) and P(OC2H5)3 (6 molpercent);; removing toluene under water-pump vac.; Kugelrohr distn. at 120°C/0.001 torr; formation of 10percent ((CH3)3Sn)2CHCH3 is observed;;