tetrakis(triphenylphosphine) palladium(0) in toluene heating soln. of Ge-compd. and catalyst in toluene (70°C), bubbling HCCH into soln. (3 h); chromy. (silica gel, hexane) or destn. (80-90°C, 0.04 Torr); MS;

in solid matrix Irradiation (UV/VIS); quartz UV cell, degassing by three freeze-pump-thaw cycles, placing th cell int aquartz windowed Dewar filled with liquid N2, irradn. with a low-pressure mercury lamp (254 nm) at 77K in 3-methylpentane matrix, warming to room temp., recooling to 77K; not isolated, detd. by UV;