Word Count : 241

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Dioxygen adducts of cobaltocenes are prepared by the controlled oxidation of cobaltocene in the presence of molecular oxygen. Cobaltocene, Co(C₅H₅)₂, is a highly reducing organometallic compound containing cobalt in the +2 oxidation state. Because of its strong electron-donating nature, it readily reacts with dioxygen under suitable conditions. The preparation is generally carried out by dissolving cobaltocene in an inert organic ____ __________ _________ _______ __________ _______ ____.
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