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the Ni complexes. After the cell was switched off, the
reaction mixture was kept at a required temperature for
the required period of time.
It turned out that the electrocatalytic process was more
efficient than the chemical reduction (cf. entries 1 and 5,
as well as 8 and 10, in Table 2). In addition, the electroꢀ
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manskii, M. Ya. Goikhman, I. V. Podeshvo, Russ. Chem.
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In conclusion, the Suzuki reaction with the polymeric
Ni catalysts can be carried out under conditions close to
the reaction conditions used to perform reactions in the
presence of PdII complexes with the same polymeric
ligands. However, the yields of the crossꢀcoupling prodꢀ
ucts are somewhat lower than those obtained with the Pd
complexes. In addition, catalysis by nickel complexes reꢀ
quires activation of the catalyst either by addition of chemꢀ
ical reducing agents or by applying the corresponding caꢀ
thodic potential. The electrochemical activation allows
one to obtain the crossꢀcoupling products with higher
yields than in the case of chemical reducing agents. An
increase in the conformational mobility of the polymeric
ligand also leads to the increase in the yield of the crossꢀ
coupling product.
This work was financially supported by the Russian
Foundation for Basic Research (Project No. 11ꢀ03ꢀ00220ꢀa).
26. T. V. Magdesieva, A. V. Dolganov, A. V. Yakimansky, M. Ya.
Goikhman, I. V. Podeshvo, Electrochim. Acta, 2009, 54, 1444.
27. T. V. Magdesieva, O. M. Nikitin, R. M. Abdullin, O. V.
Polyakova, A. V. Yakimanskii, M. Ya. Goikhman, I. V. Poꢀ
deshvo, Russ. Chem. Bull., Int. Ed., 2009, 58, 1423 [Izv. Akad.
Nauk, Ser. Khim., 2009, 1382].
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Chemistry II, Eds J. A. McCleverty, T. J. Meyer, Elsevier
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Received November 11, 2011;
in revised form April 19, 2012