Bunte salt

In organosulfur chemistry, a Bunte salt is an archaic name for salts with the formula RSSO3–Na+. They are also called S-alkylthiosulfates or S-arylthiosulfates. These compounds are typically derived from alkylation on the pendant sulfur of sodium thiosulfate:
 * RX +  Na2S2O3   →  Na[O3S2R]  +  NaX

They have been used as intermediates in the synthesis of thiols. They are also used to generate unsymmetrical disulfides:
 * Na[O3S2R] +  NaSR'   →   RSSR'  +  Na2SO3

According to X-ray crystallography, they adopt the expected structure with tetrahedral sulfur(VI) atom, a sulfur-sulfur single bond, and three equivalent sulfur-oxygen bonds.