在温和的反应条件下,将呋喃甲烷含氧化合物催化加氢脱氧成高碳支链喷气发动机和柴油燃料系列烷烃是一种有前景的策略,可实现高能效生产,并且对不希望有的产品进行最低程度的C-C裂解。在这里,我们报告说,强路易斯酸性助催化剂可以克服呋喃甲烷加氢脱氧在较低温度下的能垒。呋喃甲烷的呋喃环首先通过加氢催化剂加氢成完全饱和的环醚,然后使其容易地开环并通过促进剂进行脱氧。在开环步骤中,在助催化剂的三氟甲磺酸酯配体的协助下,在醚基O和路易斯酸性金属中心之间形成了一个环状中间体。用对称的单个呋喃环替代分子探测反应路径表明,启动子对于开环是必需的。单个呋喃环代用品比多个呋喃环呋喃基甲烷更快地发生开环含氧化合物的脱氧。最高97%的喷气燃料范围烷烃在C中的选择性为93%在最佳条件下由C 15-呋喃甲烷获得15 H 32和C 14 H 30。具有所需碳原子数的烷烃的收率和选择性可以使用具有定制碳链,呋喃原子数和最小化C-C裂解的碳中心的呋喃甲烷进行调整。
DOI:
10.1021/acscatal.7b00986
作为产物:
描述:
三氟甲磺酸 、 氯化铪 以
not given 为溶剂,
以100%的产率得到hafnium tetrakis(trifluoromethanesulfonate)
Stereoselective Helix-Sense-Selective Cationic Polymerization of <i>N</i>-Vinylcarbazole Using Chiral Lewis Acid Catalysis
作者:Cole C. Sorensen、Frank A. Leibfarth
DOI:10.1021/jacs.2c02738
日期:2022.5.18
applications such as nonlinear optics and chiral separations. Currently, no methods exist for the cationic helix-sense-selective polymerization of prochiral vinyl monomers, which limits access to a number of potentially valuable optically active helical polymers. Here, we demonstrate the first stereoselective cationic helix-sense-selective polymerization of a prochiral vinyl monomer, which provides access to
The synthesis and structural characterisation of two polynuclear hafnium(IV) complexes
作者:Scott J. Dalgarno、Jerry L. Atwood、Colin L. Raston
DOI:10.1016/j.ica.2006.03.018
日期:2007.3
Attempts to form extended supramolecular structures incorporating hafnium(IV) complexes of p-sulfonatocalix[6]arene resulted in the serendipitous formation of two polynuclear-hafnium clusters. Subsequent reaction between hafnium triflate and 1 M sulfuric or p-toluenesulfonic acid solutions also led to the formation of the same clusters, identified as cations based on Hf-17 and Hf-4, respectively. (c) 2006 Elsevier B.V. All rights reserved.
Hafnium(IV) Trifluoromethanesulfonate, An Efficient Catalyst for the Friedel–Crafts Acylation and Alkylation Reactions
作者:Iwao Hachiya、Mitsuhiro Moriwaki、Shu Kobayashi
DOI:10.1246/bcsj.68.2053
日期:1995.7
Hafnium(IV) trifluoromethanesulfonate (hafnium(IV) triflate, Hf(OTf)4) was synthesized from hafnium tetrachloride and trifluoromethanesulfonic acid. The triflate thus prepared was found to be effec...
Hydrodeoxygenation of Furylmethane Oxygenates to Jet and Diesel Range Fuels: Probing the Reaction Network with Supported Palladium Catalyst and Hafnium Triflate Promoter
作者:Saikat Dutta、Basudeb Saha
DOI:10.1021/acscatal.7b00986
日期:2017.8.4
Catalytichydrodeoxygenation of furylmethane oxygenates to highcarbon branched chain jet and diesel fuel rangealkanes under mild reaction conditions is a promising strategy for energy-efficient production of fuels with minimal C–C cracking to undesired products. Here, we report that a strong Lewis acidic promoter can overcome the energy barrier for furylmethanehydrodeoxygenation at lower temperature
在温和的反应条件下,将呋喃甲烷含氧化合物催化加氢脱氧成高碳支链喷气发动机和柴油燃料系列烷烃是一种有前景的策略,可实现高能效生产,并且对不希望有的产品进行最低程度的C-C裂解。在这里,我们报告说,强路易斯酸性助催化剂可以克服呋喃甲烷加氢脱氧在较低温度下的能垒。呋喃甲烷的呋喃环首先通过加氢催化剂加氢成完全饱和的环醚,然后使其容易地开环并通过促进剂进行脱氧。在开环步骤中,在助催化剂的三氟甲磺酸酯配体的协助下,在醚基O和路易斯酸性金属中心之间形成了一个环状中间体。用对称的单个呋喃环替代分子探测反应路径表明,启动子对于开环是必需的。单个呋喃环代用品比多个呋喃环呋喃基甲烷更快地发生开环含氧化合物的脱氧。最高97%的喷气燃料范围烷烃在C中的选择性为93%在最佳条件下由C 15-呋喃甲烷获得15 H 32和C 14 H 30。具有所需碳原子数的烷烃的收率和选择性可以使用具有定制碳链,呋喃原子数和最小化C-C裂解的碳中心的呋喃甲烷进行调整。