Cyclopentadienyl, complexes with

More than 80 % of all organotransition metal compounds are cyclopentadienyl complexes with Cp (C5H5) and Cp (CsMes) being the most prominent cyclopentadienyl systems used [1]. However, during the past few years functionalized cyclopentadienyl systems which do not just act as innocent spectator ligands have become very attractive. 

Alkyl-bridged cyclopentadienyl complexes, with manganese, 5,819... 

Cycloalkenes, into if-allyl palladium complexes, 8, 363 Cycloalkenyl rings, metal complex conformational interconversions, 1, 414 Cycloalkynes, in nickel complexes, 8, 147 (Cyclobutadiene)cyclopentadienyl complexes, with cobalt, polymercuration, 2, 435 Cyclobutadienes... 

Furthermore, we could show that this reaction mechanism to produce Cp-complexes of "mTc is not limited to carboxylate derivatives of Cp but that also further functionalities can be conjugated to receive, e.g., amides (49 and 50) [125]. This reactivity implies that, comparable to the SAAC approach, Thiele s acid derivatives can be incorporated in, e.g., a peptide strand and directly be labeled with [99mTc(OH2)3(CO)3]+. The preparation of cyclopentadienyl complexes with a variety of functionalities attached to the cyclopentadienyl ring stands for a more routine introduction of this important tridentate ligand in radiopharmaceutical organometallic complexes. 

There is a pronounced tendency for ruthenium cyclopentadienyl complexes with attached phosphorus ligands to undergo a wide variety of intramolecular metallation reactions. Heating (T75-C5H5)(PPh3)2RuMe in decalin for 24 hours leads to the orthometallated complex 135 in reasonable yield [Eq. (Ill)] (6,103). The mechanism presumably involves initial loss of... 

A number of molecular mechanics studies of metal cyclopentadienyl complexes have been reported recently. The systems studied include linear metallocenes (in particular ferrocene), ferrocene derivatives (such as complexes with substituted cyclopentadienyl ligands, bis(fulvalene)diiron complexes, ferrocenophanes and mixed ligand complexes with carbonyls and phosphines), and non-linear cyclopentadienyl complexes with various metal centers110, 127,15 >439 452(... 

Cobalt, cyclopentadienyl complexes with thioformaldehyde, 55, 14 Cocaine analogs, isoxazolines, 60, 297 Coenzyme factor 420, synthesis, 55, 192 Colloidal media, iodination of pyrazoles in. 57, 344... 

Among the products of interaction of the ruthenium cyclopentadienyl complexes with alkynes, ruthenacycopenta-dienes and ruthenacyclopentatrienes occur quite often <1991JCD1589, 1997M1189, 1998CRV2599, 1998CRV2797,... 

Fig. 8a-b. Histograms of REC values for cyclopentadienyl complexes with Cr and Fe, respectively. The interquartile ranges are 30.95 and 26.3 kcal/mol, respectively (see text). 

The first group 5 cyclopentadienyl complexes with a pendant phosphane ligand were reported very recently by Fryzuk. Ligands 35 and 36 were treated with NbCl3(DME) to give niobium bischelates 207 and 208 in 80% yield (Scheme 35). Carbonylation gave 209 and 210 in 80% yield both were characterized by X-ray structure analyses. Oxidation with PbCL resulted in formation of trichlorides 211 and 212, which can also be obtained from the anionic ligands by treatment with Nb(0)Cl3(THF)2 (Scheme 36). 211 was structurally characterized. ... 

No group 10—12 cyclopentadienyl complexes with pendant phosphane ligands have been reported thus far. 

In summary, there are quite a number of interesting cyclopentadienyl complexes with pendant arsenic ligands. However, all this has been found by a single... 

There are few papers dealing with cyclopentadienyl complexes with pendant sulfur ligands. 

In summary, there are a few papers on cyclopentadienyl complexes with pendant sulfur ligands. The field has just begun to be developed, and certainly in the future there will be many new results. 

Halides and other salts as well as metal carbonyls sometimes react with cyclopentadiene to afford cyclopentadienyl complexes with concomitant evolution of hydrogen, hydrogen chloride, or other reduction products, such as CjHg. These reactions take place under relatively severe conditions at high temperatures and often under elevated pressures ... 

Sitzmann, H. Saurenz, D. Nickel cyclopentadienyl complexes with 16 valence electrons. Book of Abstracts, 219th ACS National Meeting, San Francisco, CA, USA, March 26-30, 2000, INOR-139. 

P. Jutzi - Cyclopentadienyl Complexes with Main-Group Elements as Central Atoms, /. Organomet. Chem. 400,1, 1990 The Versatility of the Pentamethylcyclopentadienyl Ligand in Main-Group Chemistry,... 

Jutzi P (1990) Cyclopentadienyl complexes with main group elements as central atoms—a decade of research. J Organomet Chem 400 1-17... 

Cyclopentadienyl complexes with a double silicon bridge are discussed in... 

Constrained geometry catalysts (CGCs) - Technically not metallocenes, but mono-cyclopentadienyl complexes with a connected amide substituent (Figure 3(e)). 

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