Информация о цитировании статьи получена из
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Дата последнего поиска статьи во внешних источниках: 17 октября 2017 г.
Аннотация:An efficient and scaled-up synthesis of the imidazol-2-ylidene-based unsymmetrical NHC precursors bearing sterically demanding hexafluoroisopropylalkoxy-group [(CF3)2(OR)C-] in ortho-position of N-aryl substituent was developed. The key step of the method involved transformation of Mes-substituted oxazolinium tetrafluoroborate salt via the reaction with the corresponding binucleophilic fluoroalkyl substituted aniline. The subsequent post-modification of the resulting hydroxyl-containing salt via simple one step O-alkylation protocol provided access to a new family of unsymmetrical fluorinated NHC precursors. The latter were further successfully utilized for the preparation of several novel metal complexes. The molecular structures of some NHC precursors and their metal complexes have been unambiguously characterized by single-crystal X-ray diffraction. A preliminary evaluation of catalytic activity of palladium complexes was performed on Buchwald-Hartwig amination reaction. As a result, two PEPPSI-type Pd-complexes have demonstrated promising activity in alkane solvents.