Abstract
Continuous-flow monolithic silica microreactor activated with anchored isolated zirconium species was shown to be a very convenient and efficient system for chemoselective Meerwein–Ponndorf–Verley reduction. It was shown that isolated Zr4+ ions covalently bonded to the silica surface and terminated with isopropoxy/hydroxo ligands can be much more catalytically active than supported zirconia. Conversion of cyclohexanone approached 100% and excellent catalytic selectivity and stability were obtained in 8cm long microreactor during 8 catalytic cycles. The microreactors also enable better control of undesired hydrolysis of highly reactive metal precursors during functionalisation of the monoliths.
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