in diethyl ether; ammonia treatment of a soln. of (CH3)3SnCl in diethylether with NaCCH in liq. NH3 at -78°C;;

in neat (no solvent) heating (120°C); distn. (atmospheric pressure);

in tetrahydrofuran

n-butyllithium in tetrahydrofuran (N2); addn. of BuLi to the alkyne in THF at 0°C, stirring (2 min), cooling to -78°C, addn. of Me3SnCl, warming to 21°C, stirring (1 h); aq. workup, extn. (pentane), solvent removal;

in tetrahydrofuran at 24°C for 1 h;;

at 8-12 atm in a sealed tube;;

triethylamine in diethyl ether Ambient temperature;

catalyst: Pd bis(dibenzylideneacetone)/P(OC2H5)3 in toluene heating soln. of (CH3)3SnCCH (20 mmol) and CH2(Sn(CH3)2)4CH2 (10 mmol) in toluene for 30 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 3percent ((CH3)3Sn)2CH2 and 10percent (CH3)6Sn2 is observed;;

in tetrahydrofuran addn. of Me3SnCCH to a soln. of (Ph2PC2H4PPh2)PtCl2 in THF and refluxing for 12 h (N2); concn. of the clear soln. up to beginning turbidity, addn. of hexane orpentane and cooling on an ice bath, filtering off the ppt., repeated washings with hexane and drying at room temp. in vacuo;

catalyst: Pd bis(dibenzylideneacetone)/P(OC2H5)3 in toluene heating soln. of (CH3)3SnCCH (20 mmol) and CH2(Sn(CH3)2)4CH2 (10 mmol) in toluene for 30 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 3percent ((CH3)3Sn)2CH2 and 10percent (CH3)6Sn2 is observed;;