18-crown-6 ether; cesium fluoride in benzene (Ar); addn. of CsF to a mixt. of phenylacetylene and 18-crown-6 in C6H6,stirring for 5 min, addn. of germanium compd., stirring at room temp. f or 5-7 h; filtration through SiO2 or Al2O3, evapn.;

in chloroform-d1 Kinetics; byproducts: (CH3)3SiCCH; react. in a NMR-tube at 23°C, addn. of the carboxylic acid soln. to the compd.; detected by NMR;

18-crown-6 ether; cesium fluoride in benzene (Ar); addn. of CsF to a mixt. of phenylacetylene and 18-crown-6 in C6H6,stirring for 5 min, addn. of germanium compd., stirring at room temp. f or 5-7 h; filtration through SiO2 or Al2O3, evapn.;