Ultrasound-Assisted Synthesis of C60 Fullerene-Fused 1,4-Oxathian-2-ones

Previously unknown C-60 fullerene-fused 1,4-oxathian-2-ones 1,9-[2 '-oxo-1 ',4 '-oxathiano]-1,9-dihydro-(C-60-I-h)[5,6]fullerene and 1,9-[3 '-Methyl-2 '-oxo-1 ',4 '-oxathiano]-1,9-dihydro-(C-60-I-h)[5,6]fullerene were obtained by a selective reaction mercaptocarboxylic acids (mercaptoacetic and 2-mercaptopropionic) with fullerene epoxide C60O in the presence of NaOH in an inert atmosphere at room temperature under ultrasonication for 1 h. The yields of the target product were estimated at 96 and 87%, respectively (by HPLC). A plausible reaction mechanism for was proposed.