ORGANOIRON COMPOUND

The discussion herein is limited to several simple compounds that are stable, readily available, and used as starting materials for many other organoiron compounds. 

The iron slurries show exceptional reactivity toward oxidative addition reactions with carbon halogen bonds. In fact, the reaction with C.FcI is so exothermic that the slurry has to be cooled to 0 °C before the addition of C F L The reaction of iron with C F Br is also quite exothermic, hence, even for this addition, the iron slurry is cooled to about 0 ° C. The organoiron compound formed in the above reactions, solvated Fe(C.F )2, reacts with CO at room temperature and ambient pressure to yiela Fe(C,F3)2(CO)2(DMEL. 

Reaction of Ee3(CO)]2 with benzoisotellurazole 46 yielded the organoiron compound 47 according to Equation (3) <19970M3194>. 

Cyclopentadienylmagnesium bromide has been known since 1914 117) and potassium cyclopentadienide since 1901 (260). Considering that many attempts had been made to prepare organoiron compounds in this manner, it is surprising that ferrocene was not reported considerably earlier. 

Ferrocene is a crystalline, largely air- and water-stable compound (mp. 172-173 °C and bp. 249 °C). It is oxidized chemically and electrochemically to the stable monocation [(C5H5)2Fe] , the ferrieinium cation containing trivalent iron this one-electron step is fiilly reversible. Ferrocene is the only organoiron compound which is soluble in mineral oil and gasoline. At the same time, it is inert to all components in the oil tank. 

Helquist has focused efforts on developing synthetically useful cyclopropanation reagents based upon the use of stable organoiron compounds which may be regarded, at least formally, as direct precursors of reactive carbene complexes. Sulfonium derivatives 1 and alkenyl complexesi have proven to be... 

---