2.7. 1 Biphasic Systems
Book
Editors: Cazin, C. ; Nolan, S.
Title: N-Heterocyclic Carbenes in Catalytic Organic Synthesis 2
Print ISBN: 9783132414006; Online ISBN: 9783132414044; Book DOI: 10.1055/b-004-140260
1st edition © 2018 Georg Thieme Verlag KG
Georg Thieme Verlag, Stuttgart
Subjects: Organic Chemistry;Chemical Reactions, Catalysis;Organometallic Chemistry;Laboratory Techniques, Stoichiometry
Science of Synthesis Reference Libraries
Parent publication
Title: Science of Synthesis
DOI: 10.1055/b-00000101
Series Editors: Carreira, E. M.; Decicco, C. P.; Fürstner, A.; Koch, G.; Molander, G.; Schaumann, E.; Shibasaki, M.; Thomas, E. J.; Trost, B. M.
Type: Multivolume Edition
Abstract

To overcome the inherent issue of catalyst recycling in homogeneous catalysis, much effort has been devoted to the heterogenization of catalysts onto solid supports and to the separation of the reactants (and/or products) and the catalyst using immiscible liquid phases (liquid multiphase catalysis). For these latter systems, solvents such as water, alcohols, ionic liquids, fluorous media, supercritical fluids, and gas-expanded liquids have been employed successfully as the catalyst phase. In this chapter, the most relevant biphasic catalytic systems involving NHC complexes are discussed. Particular attention is devoted to alkene metathesis, which is considered to be one of the most important processes that uses complexes with carbene ligands. Sulfonated or related water-soluble carbene ligands are also described for biphasic reactions, such as cyclization, C–C bond formation, and hydroformylation.
Key words
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