Sulfur . Of sulfur nucleophiles , hydrogen sulfide and its salts , thiols ( RSH ) , thiolate anions ( RS − ) , anions of thiolcarboxylic acids ( RC ( O ) - S − ) , and anions of dithiocarbonates ( RO-C ( S ) - S − ) and dithiocarbamates ( R2N-C ( S ) - S − ) are used most often .
Of sulfur nucleophiles , hydrogen sulfide and its salts , thiols ( RSH ) , thiolate anions ( RS − ) , anions of thiolcarboxylic acids ( RC ( O ) - S − ) , and anions of dithiocarbonates ( RO-C ( S ) - S − ) and dithiocarbamates ( R2N-C ( S ) - S − ) are used most often .