Creation of metal complexes that utilize naturally abundant calcogen source as reactants in synthetic chenistry

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We examined reactions of metal complexes with naturally abundant chalcogen source and catalytic reactions in atom transfer between substrates and the chalcogen source. Mononuclear ruthenium(II) complexes having nitrogen containing tetradentate ligands were synthesized and employed as a catalyst in sulfur atom transfer from inorganic sulfur and norbornen. Mononuclear molybdenum and tungsten complexes having one terminal sulfide or selenido group were prepared as models of molybdenum and tungsten enzyme active sites, where hydrogensulfide and hydrogenselenide ions were used. Their atom transfer reactivity to triphenylphosphines was investigated. Mononuclear osmium complexes with nitrogen containing tetradentate ligands were synthesized and were revealed to catalyze 1,2-dyhydroxylation of alkenes with hydrogen peroxide.