How is 1,1'-[Disulfanediylbis(methylene)]dibenzene (CAS: 150-60-7) typically synthesized?

1,1'-[Disulfanediylbis(methylene)]dibenzene is typically synthesized through the coupling of two diphenyl disulfides via a thiol-ene reaction using a catalyst like tetrabutylammonium bromide. The reaction typically occurs in the presence of an appropriate solvent, such as toluene, at elevated temperatures. The yield is generally high, and the selectivity is excellent.