The smooth reaction of 3-chloro-3-(chlorosulfanyl)-2,2,4,4-tetramethylcyclobutanone (3) with 3,4,5-trisubstituted 2,3-dihydro-1H-imidazole-2-thiones 8 and 2-thiouracil (10) in CH 2 Cl 2 /Et 3 N at room temperature yielded the corresponding disulfanes 9 and 11 (Scheme 2), respectively, via a nucleophilic substitution of Cl À of the sulfanyl chloride by the S-atom of the heterocyclic thione. The analogous reaction of 3-cyclohexyl-2,3-dihydro-4,5-diphenyl-1H-imidazole-2-thione (8b) and 10 with the chlorodisulfanyl derivative 16 led to the corresponding trisulfanes 17 and 18 (Scheme 4), respectively. On the other hand, the reaction of 3 and 4,4-dimethyl-2-phenyl-1,3-thiazole-5(4H)-thione (12) in CH 2 Cl 2 gave only 4,4-dimethyl-2-phenyl-1,3-thiazol-5(4H)-one (13) and the trithioorthoester derivative 14, a bis-disulfane, in low yield (Scheme 3). At À 788, only bis(1-chloro-2,2,4,4-tetramethyl-3-oxocyclobutyl)polysulfanes 15 were formed. Even at À 788, a 1:2 mixture of 12 and 16 in CH 2 Cl 2 reacted to give 13 and the symmetrical pentasulfane 19 in good yield (Scheme 5).
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