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When norbornene is treated with a catalytic amount of Os04 at 60"C, a substantial yield of ring-opened metathesis polymer is obtained among the products; this result provides strong evidence that transient oxometallacyclobutane species are formed using this alkene oxidation reagent.The mechanism of the reaction of Os04 with alkenesl-2 is now a classic problem in the field of oxidation reactions and catalysis. The textbook mechanism is a direct [3 + 21

Equimolar reaction of dicyclopentadienyl‐Mg (III) with the title metalates (II) results in formation of the trinuclear products (I).

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