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Inhibition of the [2 + 2 + 2] Cyclization by the Formation of Chelates: Alkyne and Vinylidene Complexes with Cyclopentadienylcobalt( I )
Author(s) -
Butenschön Holger,
Kettenbach Ralf T.,
Krüger Carl
Publication year - 1992
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199210661
Subject(s) - alkyne , cyclopentadienyl complex , cobalt , chelation , chemistry , carbene , yield (engineering) , ligand (biochemistry) , metal , medicinal chemistry , polymer chemistry , stereochemistry , organic chemistry , catalysis , materials science , receptor , biochemistry , metallurgy
The trimerization of alkynes to arenes usually observed in the reaction of cyclopentadienyl‐cobalt(I) complexes with alkynes could be prevented by chelation of the metal center with a “phosphane arm” on the cyclopentadienyl ligand. Instead alkyne complexes were obtained in very good yields. The reaction with ethyne leads to the vinylidene complex 1 (88 % yield), a possible precursor to the carbene–cobalt complex.