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Reduced graphene oxide (rGO) served as a green catalyst with ambient oxygen as a clean oxidant for dearomatizing cyclizations of naphthol Mannich bases with carbon disulfide under mild conditions. Notably, this process provides novel and efficient one-pot access to spiro thiazolidinethione compounds. Fourier transform infrared analysis, transmission electron microscopy, atomic force microscopy, X-ray photoelectron microscopy, thermogravimetric analysis, Raman analysis, and X-ray diffraction were used to characterize rGO. And, the rGO can be reused at least six times without significant loss of catalytic activity. A possible reaction mechanism was proposed. In addition, some target compounds showed inhibition against Sclerotinia sclerotiorum, Botrytis cinerea, Thanatephorus cucumeris, and other fungi.

Cerium Ammonium Nitrate-Catalyzed Aerobic Oxidative Coupling of Dithiocarbamates: Facile Synthesis of Thioureas and Bis(aminothiocarbonyl)disulfides. -The starting materials (I), (VI), and (VIII) are used as their triethylamine or DABCO salts. -(LI, T.-T.; SONG, X.-H.; WANG, M.-S.; MA*, N.; RSC Adv. 4 (2014) 75, 40054-40060, http://dx.