Iron carbonyl complexes cyclopentadienyl derivatives

Compounds Derived from Alkynes and Carbonyl Complexes of Cobalt, 12, 323 Conjugate Addition of Grignard Reagents to Aromatic Systems, 1, 221 Coordination of Unsaturated Molecules to Transition Metals, 14, 33 Cyclobutadiene Metal Complexes, 4, 95 Cyclopentadienyl Metal Compounds, 2, 365 Diene-Iron Carbonyl Complexes, 1,1... 

The treatment of metal carbonyls (especially those of iron) with acetylenes affords, together with other products, cyclopentadienone and quinone complexes, in which one or two carbonyl groups respectively have been incorporated with two acetylene molecules into a cyclic organic ir-bonding system. These complexes can also be obtained by direct reaction between iron carbonyls and cyclopentadienone or quinone ligands. Other products in these reactions include complexes of substituted ( clobutadienes, and ir-cyclopentadienyl derivatives. Some examples are shown in Figure 49. 

In a similar manner, Jt-allyl complexes of manganese, iron, and molybdenum carbonyls have been obtained from the corresponding metal carbonyl halides [5], In the case of the reaction of dicarbonyl(r 5-cyclopentadienyl)molybdenum bromide with allyl bromide, the c-allyl derivative is obtained in 75% yield in dichloromethane, but the Jt-allyl complex is the sole product (95%), when the reaction is conducted in a watenbenzene two-phase system. Similar solvent effects are observed in the corresponding reaction of the iron compound. As with the cobalt tetracarbonyl anion, it is... 

The organometallic chemistry of the first-row transition metals generally starts with the binary metal carbonyl organometallic complexes. Noncarbonyl organometallic complexes starting with other easily accessible binary compounds provide entries to a broader spectrum of complexes. In this context, we describe the synthesis of the mixed sandwich complex (tj5-pentamethylcyclopentadienyl) ( j5-cyclopentadienyl) iron as an example of the synthetic utility of the solution-stable derivative (>j5-pentamethyl-cyclopentadienyl) (2,4-pentanedionate) iron. 

Acetyl derivatives of iron(II) arising from carbonyl insertion into the iron-methyl bond of complexes not containing cyclopentadienyl groups have been reported, as well ... 

As iron forms cyclobutadiene complexes preferentially in the (0) oxidation state, the best starting materials for these complexes are Fe(0) compounds such as the carbonyls. Cobalt, however, tends to form Co(I) (also cyclobutadiene complexes. The best known one (cyclopentadienyl)(tetra-phenylcyclobutadiene)cobalt (XXVIII), has been prepared from cyclo-pentadienylcobalt(I) derivatives and also from cobaltocene, a cobalt(II)... 

The chemistry of the metal carbonyls has been the subject of hundreds of research papers, most of them appearing in the last decade of renaissance of inorganic chemistry. Reviews have appeared on the metal carbonyls themselves (/, 2) and on such related topics as the anionic carbonyl-metallates (S), metal-olefin complexes (4,5), tricarbonyl(diene)iron species (6), perfluoroalkyl metal compounds (7), andTr-cyclopentadienyl andir-arene (S, 9) metal derivatives. ... 

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