(Diene) Fe (CO)
3 complexes enjoy widespread use in organic synthesis, because they are synthetically equivalent to free dienes, yet are more stable and possess markedly different chemical properties. Complexation and decomplexation of diene Fe (CO)
3 compounds is readily accomplished and provides high yields in most cases. In addition, unsymmetrically substituted dienes are prochiral and, therefore, the corresponding Fe (CO)
3 complexes, are chiral. Considerable attention has been directed toward the efficient use of this temporally introduced chirality to construct neighboring stereogenic centers. Indeed, this is the main subject of Fe (CO)
3 complex chemistry, along with research on a practical method for synthesizing chiral (diene) Fe (CO)
3 complexes. Another fascinating aspect of these complexes is the mobility of the Fe (CO)
3 unit, which has received less attention than its stereodirecting ability. The Fe (CO)
3 moiety, which attaches to dienyl compounds by coordination, can move one carbon unit accompanied by isomerization of the diene via a η
5 cation intermediate (1, 2-migration). This article presents the recent studies on iron tricarbonyl units to control the regio- and stereochemistry of nucleophilic addition to a neighboring C=X (X=O, N) double bond and η
5- (pentadienyl) iron (+1) cation complex.
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