生物催化已成为合成化学中的强大工具,其中酶被用于在温和条件下生产高选择性产品。以级联方式使用光催化再生的辅因子与酶协同组合,提供了生产特定化合物的有效合成途径。然而,由于光生活性氧对生物材料的快速降解,酶和光催化剂的组合受到了限制,这会使酶材料变性和失活。在这里,我们设计了核壳结构的多孔纳米光反应器,用于在有氧条件下进行高度稳定和可回收的光生物催化。酶促辅因子 NAD +来自NADH的光活性有机硅核可以有效地再生,而光生活性氧物质通过非光活性壳被捕获和失活,从而保护酶材料。这些光催化核壳纳米反应器的多功能性与两种不同的酶系统(甘油脱氢酶和葡萄糖 1-脱氢酶)串联得到证明,其中观察到核壳光催化系统的长期酶稳定性。
Organosilane compound and organosilica obtained therefrom
申请人:Mizoshita Norihiro
公开号:US20080227939A1
公开(公告)日:2008-09-18
Provided is an organosilane compound expressed by any one of the following general formulae (1) to (7):
(wherein: Ar represents a phenylene group or the like; R
1
represents a hydrogen atom or the like; R
2
to R
8
each represent a methyl group or the like; n represents an integer in a range from 0 to 2; m represents an integer of 1 or 2; L represents a single bond or the like; X represents a hydrogen atom or the like; and Y represents a hydrogen atom or the like).
Meerwein's Reagent Mediated, Significantly Enhanced Nucleophilic Fluorination on Alkoxysilanes
作者:Toyoshi Shimada、Yogesh Jorapur
DOI:10.1055/s-0031-1290757
日期:2012.4
We developed a new facile method to fluorosilanes from alkoxysilanes using Meerwein’s reagent. Our protocol afforded fluorosilanes in excellent yields in various organic solvents including acetonitrile under mild reaction conditions at room temperature. We also proposed a reaction mechanism with the probable silyloxonium intermediates.
A series of molecular building blocks containing allylsilyl groups, which can be incorporated into the appropriate sol-gel precursors as fragments, were prepared. The allylsilyl group is retained unchanged over the course of all reactions giving sol-gel precursors and behave as the synthetic equivalent of alkoxysilyl groups toward sol-gel polymerization, but are stable enough to allow purification by silica gel chromatography. These allylsilanes were successfully used as building blocks to construct functional sol-gel precursors via palladium-catalyzed coupling reactions. (C) 2007 Elsevier Ltd. All rights reserved.
An Efficient Method for the Synthesis of Symmetrical Disiloxanes from Alkoxysilanes Using Meerwein's Reagent
作者:Toyoshi Shimada、Yogesh Jorapur
DOI:10.1055/s-0031-1290668
日期:2012.7
report here a new and efficient route to symmetrical disiloxanes from their corresponding alkoxysilanes using Meerwein’s reagent as mediator and potassium carbonate as additive under mild reaction conditions in acetonitrile. Our methodology is very simple, economic, and high yielding. We have also proposed a reaction mechanism with the plausible silyloxonium intermediates. We report here a new and efficient
Aerobic Photobiocatalysis Enabled by Combining Core–Shell Nanophotoreactors and Native Enzymes
作者:Wenxin Wei、Francesca Mazzotta、Ingo Lieberwirth、Katharina Landfester、Calum T. J. Ferguson、Kai A. I. Zhang
DOI:10.1021/jacs.2c00576
日期:2022.4.27
enzymatic cofactor NAD+ from NADH can be efficiently regenerated by the photoactive organosilica core, while photogenerated active oxygen species are trapped and deactivated through the non-photoactive shell, protecting the enzymatic material. The versatility of these photocatalytic core–shell nanoreactors was demonstrated in tandem with two different enzymatic systems, glycerol dehydrogenase and glucose
生物催化已成为合成化学中的强大工具,其中酶被用于在温和条件下生产高选择性产品。以级联方式使用光催化再生的辅因子与酶协同组合,提供了生产特定化合物的有效合成途径。然而,由于光生活性氧对生物材料的快速降解,酶和光催化剂的组合受到了限制,这会使酶材料变性和失活。在这里,我们设计了核壳结构的多孔纳米光反应器,用于在有氧条件下进行高度稳定和可回收的光生物催化。酶促辅因子 NAD +来自NADH的光活性有机硅核可以有效地再生,而光生活性氧物质通过非光活性壳被捕获和失活,从而保护酶材料。这些光催化核壳纳米反应器的多功能性与两种不同的酶系统(甘油脱氢酶和葡萄糖 1-脱氢酶)串联得到证明,其中观察到核壳光催化系统的长期酶稳定性。