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In organometallic chemistry, a flyover complex features two metals bridged by the fragment OC2. Some flyover complexes are symmetrical and some are not.
Common examples are the iron carbonyl derivatives, which are typically air-stable, soluble in nonpolar solvents, and red-orange in color. These diiron complexes arise by the reaction of alkynes with iron carbonyls. Such reactions are known to generate many products, e.g. complexes of cyclopentadienones and para-quinones.
Some ferrole complexes react with tertiary phosphines to give the substituted flyover complex Fe25. They insert alkynes en route to tropones.
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