Retracted: Chemoselective Reactions of (E)-1,3-Dienes: Cobalt-Mediated Isomerization to (Z)-1,3-Dienes and Reactions with Ethylene
Yam N. Timsina, Souvagya Biswas and T. V. RajanBabu*
*Department of Chemistry and Biochemistry, The Ohio State
University, Columbus, Ohio 43210, United States, Email: rajanbabu.1
osu.edu
Y. N. Timsina, S. Biswas, T. V. RajanBabu, J. Am. Chem. Soc., 2014, 136, 6215-6218.
DOI: 10.1021/ja501979g
Note
The authors retract this Communication because one of the major conclusions of the work [the (E) to (Z) isomerization of a 1,3-diene] is wrong and resulted from a misinterpretation of the experimental results. We found that under the ethylene-free reaction conditions certain Co-catalysts, in a highly selective reaction, consume only the (E)-isomer from a mixture of geometrical isomers to give higher molecular weight oligomers leaving behind the pure (Z)-isomer. The oligomers were not detected in our characterization, which resulted in a wrong conclusion that the (E) isomer was converted into the (Z) isomer.
see article for more reactions
Abstract
Co complexes with large-bite angle phosphine ligands promote an unusual isomerization of E/Z-mixtures of 1,3-dienes to yield almost exclusively the Z-isomer.
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Key Words
ID: J48-Y2014
