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Updated: Sep 19, 2026
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
CpCo-Benzoquinone Complexes: Convenient CpCo(I) PrecatalystsSynthesis and Reactivity
Rahamdil Usman1, Uwe Monkowius2, Marko Hapke1,2,3
1Institute for Catalysis (INCA), Johannes Kepler University Linz (JKU), Altenberger Strasse 69, A-4040 Linz, Austria.
Abstract:
We report an improved, convenient, and general synthesis of the air-stable complex CpCo-(DQ) (DQ = duroquinone), originally described by Schrauzer and Thyret in 1963, and applied this general protocol to the preparation of a series of related CpCo-(p-benzoquinone) complexes with yields ranging from 35 to 96%. The complexes were characterized by single-crystal X-ray diffraction, and the bonding characteristics were compared to those of other CpCo-olefin complexes. Their catalytic performance was evaluated in cyclotrimerization reactions under both thermal and photochemical conditions for the synthesis of pyridine and benzene derivatives.
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