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.
The original paper was published on April 8, 2014 and was retracted on February 7, 2018.