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New 1,2,4,5-tetrakis-(N-imidazoliniummethyl)benzene and 1,2,4,5-tetrakis(N-benzimidazoliummethyl)benzene salts as N-heterocyclic tetracarbene precursors: synthesis and involvement in ruthenium-catalyzed allylation reactions

2010    Gurbuz, Nevin; Demir, Serpil; Ozdemir, Ismail; Cetinkaya, Bekir; Bruneau, Christian

New tetraimidazolinium and tetrabenzimidazolium salts have been prepared Upon reaction with (BuOK)-Bu-t. they generate carbene ligands, which were associated in situ to [RuCp'(MeCN)(3)]PF6 to produce new ruthenium catalysts that are active for the Substitution of allylic substrates by amines, phenols, and carbonucleophiles The influence of the N-heterocyclic core as well as that of the N-substitutents at the periphery of the salts, on reactivity and regioselectivity have been exammed (C) 2009 Elsevier Ltd All rights reserved