Gj. Bodwell et al., SODIUM SULFIDE ADSORBED ON ALUMINA AS A REAGENT FOR THE FACILE SYNTHESIS OF 2,11-DITHIA-[3.3]METACYCLOPHANES, Synlett, (7), 1995, pp. 751-752
2,11-Dithia[3.3]metacyclophanes without internal substituents can be p
repared rapidly, easily and in moderate yield by using sodium sulfide
adsorbed on alumina (Na2S/Al2O3).