METHODS FOR PREPARING FORMALDEHYDE FROM CARBON DIOXIDE
申请人:THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
公开号:US20200317594A1
公开(公告)日:2020-10-08
The present disclosure provides, inter alia, methods for preparing formaldehyde from carbon dioxide using bis(silyl)acetals, methods for incorporating carbon derived from carbon dioxide into a complex organic molecule derived from formaldehyde using bis(silyl)acetals, and methods for generating an isotopologue of a complex organic molecule derived from formaldehyde using bis(silyl)acetals.
Zinc and Magnesium Catalysts for the Hydrosilylation of Carbon Dioxide
作者:Michael Rauch、Gerard Parkin
DOI:10.1021/jacs.7b10776
日期:2017.12.20
systems for the hydrosilylation of CO2 by R3SiH to afford sequentially the bis(silyl)acetal, H2C(OSiR3)2, and CH4 (R3SiH = PhSiH3, Et3SiH, and Ph3SiH). In contrast to many other catalysts for these transformations, both the zinc and magnesium catalytic systems are active at room temperature, and the latter provides the first example of catalytic hydrosilylation of CO2 involving a magnesium compound. Also
具有三[(1-异丙基苯并咪唑-2-基)二甲基甲硅烷基]甲基配体的末端氢化锌和镁化合物[κ3-TismPriBenz]ZnH和[TismPriBenz]MgH与B(C6F5)3反应得到离子对,[TismPriBenz]M}[HB(C6F5)3] (M = Zn, Mg),它们是这些金属在三角单锥配位环境中的罕见例子。值得注意的是,与 B(C6F5)3 结合,[TismPriBenz]M}-[HB(C6F5)3] 生成催化系统,用于通过 R3SiH 对 CO2 进行氢化硅烷化,依次提供双(甲硅烷基)缩醛,H2C(OSiR3)2和 CH4(R3SiH = PhSiH3、Et3SiH 和 Ph3SiH)。与用于这些转化的许多其他催化剂相比,锌和镁催化体系在室温下均具有活性,后者提供了涉及镁化合物的 CO2 催化氢化硅烷化的第一个例子。
From Carbon Dioxide to Methane: Homogeneous Reduction of Carbon Dioxide with Hydrosilanes Catalyzed by Zirconium−Borane Complexes
作者:Tsukasa Matsuo、Hiroyuki Kawaguchi
DOI:10.1021/ja0647250
日期:2006.9.1
A mixture of a zirconium benzyl phenoxide complex and tris(pentafluorophenyl)borane is reported that catalyzes the hydrosilation reaction of carbondioxide to generate methane via a bis(silyl)acetal intermediate.
Hydrosilylative reduction of carbon dioxide by a homoleptic lanthanum aryloxide catalyst with high activity and selectivity
作者:Kejian Chang、Iker del Rosal、Xizhou Zheng、Laurent Maron、Xin Xu
DOI:10.1039/d1dt01074c
日期:——
which uses a combination of a simple, homoleptic lanthanum aryloxide and B(C6F5)3, was performed. Use of a less sterically hindered silane led to an exclusive reduction of CO2 to CH4, with a turnover frequency of up to 6000 h-1 at room temperature. The catalytic system is robust, and 19 400 turnovers could be achieved with 0.005 mol% loading of lanthanum. The reaction outcome depended highly on the nature
使用简单、均质的芳基氧化镧和 B(C6F5)3 的组合,对 CO2 进行了有效的串联氢化硅烷化。使用空间位阻较小的硅烷导致 CO2 完全还原为 CH4,室温下的周转频率高达 6000 h-1。催化系统是稳健的,在镧的负载量为 0.005 mol% 的情况下可以实现 19 400 次转化。反应结果很大程度上取决于所用硅烷还原剂的性质。当使用空间体积大的硅烷时,观察到没有过度还原的甲醛等价物即双(甲硅烷基)缩醛的选择性生产。通过化学计量反应和DFT计算阐明了反应机理。
An Efficient Iridium Catalyst for Reduction of Carbon Dioxide to Methane with Trialkylsilanes
作者:Sehoon Park、David Bézier、Maurice Brookhart
DOI:10.1021/ja305318c
日期:2012.7.18
Cationic silane complexes of general structure (POCOP)Ir(H)(HSiR3) POCOP = 2,6-[OP(tBu)(2)](2)C6H3} catalyze hydrosilylations of CO2. Using bulky silanes results in formation of bis(silyl)acetals and methyl silyl ethers as well as siloxanes and CH4. Using less bulky silanes such as Me2EtSiH or Me2PhSiH results in rapid formation of CH4 and siloxane with no detection of bis(silyl)acetal rind methyl silyl ether intermediates. The catalyst system is long-lived, and 8300 turnovers can be achieved using Me2PhSiH with a 0.0077 mol % loading of iridium. The proposed mechanism for the conversion of CO2 to CH4 involves initial formation of the unobserved HCOOSiR3. This formate ester is then reduced sequentially to R3SiOCH2OSiR3, then R3SiOCH3, and finally to R3SiOSiR3 and CH4.