Sulfurization of Diketones with Lawesson's Reagent (LR). The sulfurization of diketones 1 was carried out with excess LR in every case, though one molecule of LR can theoretically sulfurize two carbonyl^.^ The sulfurization of diketone la proceeded easily. Heating la with LR in refluxing benzene for 6 h resulted in the complete consumption of la. Chromatographic workup of the mixture gave disulfide 2 (80%) and trithiolane 3a (13%). The reaction ...
