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The reaction of diarylacetylenes with CoCl(PPh3)3 and sodium cyclopentadienylide or sodium carbomethoxycyclopentadienylide gave (eta4-tetra-arylcyclobutadiene)(eta5-cyclopentadienyl)cobalt and (eta4-tetra-arylcyclobutadiene)(eta5-carbomethoxycyclopentadienyl)cobalt, respectively, where aryl = para-XC6H4 (X = CF3, F, MeO). The reaction was unsuccessful for the synthesis of (eta4-tetra(para-methoxyphenyl)cyclobutadiene)(eta5-cyclopentadienyl)cobalt, which was synthesised instead from dicarbonyl(eta5-cyclopentadienyl)cobalt. In all of the examples starting with CoCl(PPh3)3 an intermediate (eta5-cyclopentadienyl)- or (eta5-carbomethoxycyclopentadienyl)(triphenylphosphine)-2,3,4,5-tetraarylcobaltacyclopentadiene complex was isolated, and two examples were characterised by X-ray crystallography. Heating the (eta5-cyclopentadienyl)- or (eta5-carbomethoxycyclopentadienyl)(triphenylphosphine)-2,3,4,5-tetraarylcobaltacyclopentadiene complexes resulted in clean conversion to the corresponding metallocenes. The influence of the para-aryl substituents on the 1H NMR of the cyclopentadienyl moiety is tabulated, together with the influence of a range of R substituents in (eta4-tetraphenylcyclobutadiene)(eta5-RC5H4)cobalt (R = CO2Me, CH2OH, Me, CHO, CCH, CO2H, CN, CONHR1, 2-oxazolinyl, NH2, NHAc, HgCl, Br, I, SiMe3, SnMe3, Ph).
I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 114615-82-6, help many people in the next few years., Reference of 114615-82-6
Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI