Synthesis of the gold-dirhenium ferrocenylacetylide cluster. The crystal structure of Re2(μ-C≡CFc){Au(PPh3)}(CO)8

The thermal reaction of Re₂(CO)₈(NCMe)₂ with Au(CCFc)PPh₃ afforded the cluster Re₂(-CCFc){Au(PPh₃)}(CO)₈, which was characterized by X-ray diffraction analysis.     

Reaction of alkyne cluster Os3(μ-CO)(CO)9(μ3-η1:η1:η2-Me3SiC2Me) with HC≡CCOOMe. Molecular and crystal structures of Os3(CO)9{μ3-η1:η1:η2:η2-C(SiMe3)C(Me)C(COOMe)CH× and Os3(CO)8{μ3-η1:η1:η4:η1-C(SiMe3)C(Me)C(H)C(COOMe)CH× complexes

Reaction of the cluster Os₃(μ-CO)(CO)₉(μ₃-η¹:η¹:η²-Me₃SiC₂Me) with HC≡CCOOMe in benzene at 70 °C results in Os₃(CO)₉{μ₃-η¹:η¹:η²:η²-C(SiMe₃)C(Me)C(COOMe)CH× (5), Os₃(CO)₉{μ₃-η¹:η¹:η²:η²-C(SiMe₃)C(Me)C(H)C(COOMe)CH× (6), Os₃(CO)₉{μ-η¹:η¹:η⁴-C(SiMe₃)C(Me)C(H)C(COOMe)CH× (7), and Os₃(CO)_δ{μ₃-η¹:η¹:η⁴:η¹-C(SiMe₃)C(Me)C(H)C(COOMe)× complexes (8), containing an osmacyclopentadiene moiety. Complexes5–8 were characterized by¹H NMR and IR spectroscopy. The structure of clusters5 and8 was confirmed by X-ray analysis. Complex7 is formed from cluster5 as a result of a new intramolecular rearrangement and complex8 is obtained by decarbonylation of compound6. Complex8 adds PPh₃ to give Os₃(CO)_δ(PPh₃){μ-η¹:η¹:η⁴-C(SiMe₃)C(Me)C(H)C(COOMe)×.     

57Fe NMR chemical shift,a sensitive indicator of the deviation of the ferrocene cyclopentadienyl rings from parallelism

Russian Chemical Bulletin -     

On the electronic influence of alkyl groups in alkylferrocenes

The ¹³C NMR signals of α- and β-carbons in methyl-, ethyl-, isopropyl- and t-butyl-ferrocenes were assigned using deuterium labelling. The electronic influence of alkyl groups in alkylferrocenes is discussed.     

Investigation of the structure of ferricenium ferrochloride by the method of gamma resonance spectroscopy

Conclusions On the basis of the data of gamma resonance spectroscopy, a hypothesis was advanced on the polymer character of the structure of the salt with the composition [Fe(C₅H₅)₂]⁺· FeCl ₃ ^– with a flat configuration of the anion.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2419–2423, November, 1974.The authors would like to express their gratitude to A. N. Nesmeyanov, V. I. Gol'danskii, and S. P. Gubin for their constant attention to the work.     

Chirality,diastereotopism and structure of α-metallocenylcarbenium ions investigated by nmr spectroscopy

1-Metallocenyl-2-methylpropyl cations are found to be chiral using nuclei diastereotopism. The positive charge distribution over the cations and the effect of a central metal atom (iron, ruthenium, osmium) are discussed.