Reversible cyclodimerization of cyclic (alkyl)(amino)carbene-carbon disulfide adduct.

The cyclic (alkyl)(amino)carbene-carbon disulfide adduct undergoes thermally induced cyclodimerization to a 1,2,4,5-tetrathiane and quantitatively dissociates back to the monomer under light irradiation. This stimulus-driven, reagent-free, and reversible bond formation and cleavage contrasts with the conventional dynamic behavior of S-S bonds.