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- W2018678943 abstract "Abstract ( R )‐(+)‐Binol‐functionalized chiral periodic mesoporous organosilicas (PMOs) with different framework compositions were successfully synthesized by cocondensation of ( R )‐2,2′‐di(methoxymethyl)oxy‐6,6′‐di(1‐propyltrimethoxysilyl)‐1,1′‐binaphthyl ( BSBinol ) with 1,2‐bis(trimethoxysilyl)ethane (BTME) and tetramethoxysilane (TMOS) using triblock copolymer P123 as a template in acidic solution. The mixture of BTME and BSBinol can result in a highly ordered mesostructure in an acidic medium but the mesoporous materials synthesized using a mixture of TMOS and BSBinol can only be obtained in a weak acidic buffer solution. All the materials are efficient catalysts (coordinated with Ti) for asymmetric addition of diethylzinc to aldehydes. The chiral PMO with ethane and ( R )‐(+)‐Binol in the framework exhibits an enantioselectivity as high as 90 % with a turnover frequency (TOF) of 104 h −1 , which is even higher than the homogeneous ( R )‐(+)‐Binol catalyst (83 % ee with TOF of 96 h −1 ) using toluene as solvent under similar conditions. This work demonstrates the positive effect of the rigid pore wall in increasing the enantioselectivity of the chiral PMOs." @default.
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- W2018678943 date "2010-04-29" @default.
- W2018678943 modified "2023-10-17" @default.
- W2018678943 title "(<i>R</i>)‐(+)‐Binol‐Functionalized Mesoporous Organosilica as a Highly Efficient Pre‐Chiral Catalyst for Asymmetric Catalysis" @default.
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- W2018678943 doi "https://doi.org/10.1002/asia.200900737" @default.
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