in neat (no solvent)

sulfur

in dimethyl sulfoxide byproducts: (CH3)3SiF, C6F5H; Hg2F2 suspended in DMSO in a Schlenk-tube and (CH3)3SiC5F5 added to thissoln. at room temp.; reacted for three weeks; low yield; organomercury(I)-compound not detected;