Alkenyl-functionalized NHC iridium-based catalysts for hydrosilylation
comunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
comunitat-uji-handle4:
INVESTIGACIONMetadata
Title
Alkenyl-functionalized NHC iridium-based catalysts for hydrosilylationDate
2008Publisher
Royal Society of ChemistryISSN
11440546Type
info:eu-repo/semantics/articleSubject
Abstract
A family of alkenyl-functionalized N-heterocyclic-carbene–iridium(I) complexes has been
synthesized, providing a series of mono-coordinated, bis-chelate and pincer alkenyl-NHC species.
Olefin coordination is highly ... [+]
A family of alkenyl-functionalized N-heterocyclic-carbene–iridium(I) complexes has been
synthesized, providing a series of mono-coordinated, bis-chelate and pincer alkenyl-NHC species.
Olefin coordination is highly influenced by the nature of the substituents on the NHC ring, and
on the length of the alkenyl branch. A fluxional process involving coordination/decoordination of
the olefin in bis-allyl-NHC complexes has been studied, and the activation parameters have been
determined by means of VT-NMR spectroscopy. The mono-coordinated complexes are highly
active in the hydrosilylation of terminal alkynes, showing high selectivity for the Z-isomers, with
no a-isomers or dehydrogenative silylation processes being observed. The molecular structures
reported that are representative of the species have been determined by means of X-ray
crystallography [-]
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Copyright 2008 Royal Society of Chemistry
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