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Type: Artigo de Periódico
Title: Encapsulation Of Chiral Fe(salen) In Mesoporous Silica Structures For Use As Catalysts To Produce Optically Active Sulfoxides
Author: Oliveira
RL; Nijholt
T; Shakeri
M; de Jongh
PE; Gebbink
RJMK; de Jong
Abstract: Solid catalysts which are heterogeneous at the macroscopic scale but homogeneous at the microscopic level were prepared by the encapsulation of Fe(salen) by a "ship in a bottle" approach. This approach permits the synthesis of a "free" Fe(salen) complex inside the nanocages of SBA-16 and m-MCF, having conformational freedom and behaving as a complex in solution. These materials were used as catalysts for asymmetric oxidation of sulfides. The entrance sizes of the mesoporous materials SBA-16 and m-MCF were tuned by changing the synthesis parameters and by silylation of the silica surface with n-propyl groups, which resulted in materials with different Fe(salen) loadings. Chiral Fe(salen) trapped in m-MCF materials showed higher activity than the complex immobilized on SBA-16. The activity and enantioselectivity of the catalysts based on m-MCF were on a par with the homogeneous counterpart under specific conditions. The heterogenized catalysts presented a limited recyclability; however, they were clearly advantageous compared to the homogenous counterpart, where reutilization was not possible.
Subject: Asymmetric Sulfide Oxidation
Aqueous Hydrogen-peroxide
Salen Complexes
Kinetic Resolution
Enantioselective Epoxidation
Key Intermediate
Rights: fechado
Identifier DOI: 10.1039/c6cy00113k
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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