Rhodium is a chemically inert transition metal. It is one of the rarest metal in the Platinum Group Metals, with a natural occurrence about 0.001 part per million in the earth's crust. As the major application of this precious metal, rhodium-containing catalytic converters help to remove toxic NOx gases from automobile exhausts to protect our environment and health. Rhodium compounds, such as dirhodium tetraacetate, have been used for selective C-H activation catalysis, which promote the syntheses of many natural products and drug molecules. Dirhodium complexes also have received considerable attention as non-platinum anti-tumor agents with limited side effects.
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