首页|Ruthenium(II) complexes bearing chelating Carboxylate-anchored normal and abnormal Carbenes: Synthesis, characterizations and catalytic applications
Ruthenium(II) complexes bearing chelating Carboxylate-anchored normal and abnormal Carbenes: Synthesis, characterizations and catalytic applications
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NSTL
Elsevier
Functionalized abnormal/mesoionic NHC (NHC = N-heterocyclic carbene) complexes have been much less investigated in contrast to their normal NHC counterparts. In this work, a series of [(CcarbeneOcarboxylate)-O-boolean AND]- and [(CcarbeneC)-C-boolean AND'(phenyl)]-type Ru(II) complexes bearing normal and abnormal NHCs have been synthesized. Their spectroscopic features, solid-state structure and aquation reactivity have also been reported. All the assynthesized complexes have served as precatalysts to catalyze intramolecular or intermolecular carboxylic acid-to-alkyne addition reactions. It was found that the catalytic behavior of abnormal NHC complexes is superior to that of the normal NHC analogs. An anti-Markovnikov addition reactivity, leading to the formation of an E-type enol ester as the major product, was observed. A few stoichiometric experiments have also been carried out to provide preliminary insight into the catalytic mechanism.
NSTL
Elsevier
