thionyl chloride in benzene slow addn. of SOCl2 soln. to Ge compd. with stirring, 3°C; pptn.; filtration under Ar; detn. by NMR;

in benzene dropwise addn. of PhAsCl to Ge compd. soln. with stirring, 0°C; heating to room temp.; pptn.; filtration under Ar; detn. by NMR;