Radial (tetracyclopentadienyl)cyclobutadiene pentametals

Modulation of Electronic Communication between Two Equivalent Ferrocenyl Groups Mediated Through Tricarbonylcyclobutadieneiron

“…In order to avoid a steric repulsion, the two ferrocenyl groups linked to Cb ring exhibit a relative syn orientation with an alignment in the opposite side of Fe(CO) 3 group. The average C‐C bond length in Cb ring compares well with earlier reported similar complex [Fc 4 CbFe(CO) 3 ] (1.46 Å) …”

Multiferrocenyl Cobalt‐Based Sandwich Compounds

“…Examples of multiferrocenyl compounds are Rausch's [Co(η 4 ‐C 4 Fc 4 )(η 5 ‐C 5 H 5 )],, perferrocenylated heterocycles of the type c C 4 Fc 4 E [ E = S, O, NMe, NPh, Zr(η 5 ‐C 5 H 5 ) 2 ],, , and 3,3′,4,4′,5,5′‐hexaferrocenyl‐2,2′‐bithiophene from our research group, and Vollhardt's as well as Astruc's (penta‐ and hexaferrocenyl)benzene and hexa(ferrocenylethynyl)benzene compounds , , . In addition, half‐sandwich compounds including Mn(η 5 ‐C 5 Fc 5 )(CO) 3 or Fe(η 4 ‐C 4 Fc 4 )(CO) 3 represent multiferrocenyl‐substituted organometallic species [Fc = Fe(η 5 ‐C 5 H 4 )(η 5 ‐C 5 H 5 )].…”

Combining Cobalt‐Assisted Alkyne Cyclotrimerization and Ring Formation through C–H Bond Activation: A “One‐Pot” Approach to Complex Multimetallic Structures

“…Perferrocenylated supercrowded cyclic and heterocyclic structures have drawn rising attention during recent years, because, aside from their attractive molecular structures, these compounds possess interesting electrochemical and spectroscopic properties 1. Examples of this family of molecules are given by Vollhardt's hexaferrocenylbenzene {Fc 6 C 6 ; Fc = Fe(η 5 ‐C 5 H 4 )(η 5 ‐C 5 H 5 )},2 tricarbonyl[pentaferrocenyl(cyclopentadienyl)]manganese [Mn(η 5 ‐Fc 5 C 5 )(CO) 3 ]3 and tricarbonyl[tetraferrocenyl(cyclopentadiene)]iron [Fe(η 5 ‐Fc 5 C 5 )(CO) 3 ],4a Rausch's tetraferrocenyl(cyclobutadiene)cyclopentadienylcobalt [Co(η 4 ‐Fc 4 C 4 )(η 5 ‐C 5 H 5 )],4b as well as perferrocenylated heterocycles of the type Fc 4 C 4 E ( E = S, O, NMe, NPh, ZrCp 2 )5 from our research group. The crowded nature of the sterically demanding ferrocenyl groups at the respective ring systems is highlighted, for example, by distortion of the cyclic unit, as demonstrated for Fc 6 C 6 by single‐crystal X‐ray diffraction analysis 2.…”