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Solid–state Synthesis of Polyhedral Oligomeric Silsesquioxane‐Supported N‐Heterocyclic Carbenes/Imidazolium salts on Palladium Nanoparticles: Highly Active and Recyclable Catalyst
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Abstract
We describe a novel and green synthetic methodology for the fabrication of polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium(II) complexes; Pd(II)‐MPIm‐POSS (
1
) composite by solid‐state annealing between Pd(OAc)
2
and octakis(3‐(1‐methylimidazolium)propyl) octasilsesquioxane without added base. Subsequently, arylboronic acid based
in situ
or
ex situ
reduction of
1
in aqueous ethanol produces polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium nanoparticles; Pd(0)‐nano‐POSS (
2
) composite, consisting of monodispersed and N‐heterocyclic carbene (NHC) stabilized Pd nanoparticles of very small size (3.0 ± 1.5 nm). Nanocatalyst
2
is a highly efficient and easily recyclable homogeneous catalyst for Suzuki‐Miyaura cross‐coupling reactions with TOF up to 1670 h
−1
.
Title: Solid–state Synthesis of Polyhedral Oligomeric Silsesquioxane‐Supported N‐Heterocyclic Carbenes/Imidazolium salts on Palladium Nanoparticles: Highly Active and Recyclable Catalyst
Description:
Abstract
We describe a novel and green synthetic methodology for the fabrication of polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium(II) complexes; Pd(II)‐MPIm‐POSS (
1
) composite by solid‐state annealing between Pd(OAc)
2
and octakis(3‐(1‐methylimidazolium)propyl) octasilsesquioxane without added base.
Subsequently, arylboronic acid based
in situ
or
ex situ
reduction of
1
in aqueous ethanol produces polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium nanoparticles; Pd(0)‐nano‐POSS (
2
) composite, consisting of monodispersed and N‐heterocyclic carbene (NHC) stabilized Pd nanoparticles of very small size (3.
0 ± 1.
5 nm).
Nanocatalyst
2
is a highly efficient and easily recyclable homogeneous catalyst for Suzuki‐Miyaura cross‐coupling reactions with TOF up to 1670 h
−1
.
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