Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 6, Issue 13, Pages 5124-5133Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cy00113k
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Funding
- European Research Council (ERC) [338846]
- Dutch National Research School Combination Catalysis (NRSCC)
- Sao Paulo Research Foundation [2015/07773-0]
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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.
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