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Swollen-induced in-situ encapsulation of chiral silver catalysts in cross-linked polysiloxane elastomers: Homogeneous reaction and heterogeneous separation.
- Source :
-
Molecular Catalysis . Oct2021, Vol. 515, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- • Swollen-induced in-situ encapsulation of catalysts in cross-linked polysiloxane elastomers polymer. • Silicone rubber-based microchannel reactor was employed for asymmetric transforms. • Cross-linked polysiloxane elastomers was proved to be easily recycled by filtration or pick-up,reused by several times and exhibits excellent enantioselectivities 94–96% ees The immobilization of molecular catalysts to fabricate heterogeneous catalysts for catalytic asymmetric transformations is extremely important and has attracted great attentions. Herein we developed a simple and new strategy for the heterogenization of homogeneous molecular complexes into the cross-linked polymer. It is demonstrated for the first time that the cross-linked polysiloxane elastomers can be applied for the swollen-induced in-situ encapsulation of homogeneous catalysts with or without chiral ligands. The swollen-induced in-situ encapsulation of silver catalyst system in the cross-linked polysiloxane elastomers led to the formation of silicone rubber-based hierarchically porous that could be used in asymmetric [3+2] cycloaddition, asymmetric tandem conjugate addition−elimination reaction and oxidation of hydrosilanes to silanols. The swollen-induced in-situ encapsulation of chiral silver complex in the cross-linked polysiloxane elastomers was proved to be easily recycled by filtration or pick-up and reused by several times. The simplest heterogeneous catalysis by the strategy of swollen-induced in-situ encapsulation can be extended to the encapsulation of chiral metal catalysts into different polymeric materials for the heterogenization of homogeneous catalysis. [Display omitted] [ABSTRACT FROM AUTHOR]
- Subjects :
- *CATALYSTS
*ENCAPSULATION (Catalysis)
*ELASTOMERS
*POLYMERS
*SILOXANES
*SILICONES
Subjects
Details
- Language :
- English
- ISSN :
- 24688231
- Volume :
- 515
- Database :
- Academic Search Index
- Journal :
- Molecular Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 162178322
- Full Text :
- https://doi.org/10.1016/j.mcat.2021.111901