in tetrahydrofuran soln. of PhSeBr in THF added under Ar or N2 to a soln. of the Ge compd. in THF, mixt. stirred at 20°C for 30 min; mixt. evapd. (vac.), residue dissolved in ether, soln. left in a refrigerator (-20°C) for 3 h, filtered, filtrate evapd., fractional crystn. from ether/hexane (2:1) in -20°C;

in diethyl ether byproducts: NaCl; react. under Ar or N2 at 25°C, 1 h; recrystd. from ether/hexane (1:2); elem. anal.;