Selective Production of Renewable <i>para</i>
-Xylene by Tungsten Carbide Catalyzed Atom-Economic Cascade Reactions
作者:Tao Dai、Changzhi Li、Lin Li、Zongbao Kent Zhao、Bo Zhang、Yu Cong、Aiqin Wang
DOI:10.1002/anie.201710074
日期:2018.2.12
catalyst in an atom‐economic and renewable synthesis of para‐xylene with excellent selectivity and yield from 4‐methyl‐3‐cyclohexene‐1‐carbonylaldehyde (4‐MCHCA). This intermediate is the product of the Diels–Alder reaction between the two readily available bio‐based building blocks acrolein and isoprene. Our results suggest that 4‐MCHCA undergoes a novel dehydroaromatization–hydrodeoxygenation cascade
Synthesis of a polymer -bound iron Lewis acid and its utilization in Diels-Alder reactions
作者:Anjan K. Saha、M.Mahmun Hossain
DOI:10.1016/s0040-4039(00)79240-9
日期:1993.6
The first polymer-bound iron Lewis acid 3 was synthesized in two steps from (η5-vinylcyclopentadienyl)dicarbonylmethyliron. Preliminary studies for catalysis of Diels-Alderreactions by the polymer-bound iron Lewis acid 3 are also reported.
Iminium ion catalysis: Use of the α-effect in the acceleration of the Diels–Alder reactionElectronic supplementary information (ESI) available: 1H NMR, 13C NMR, IR and MS spectra. See http://www.rsc.org/suppdata/cc/b2/b212239a/
作者:Julie L. Cavill、Jens-Uwe Peters、Nicholas C. O. Tomkinson
DOI:10.1039/b212239a
日期:2003.3.6
The alpha-effect can be used in the acceleration of the Diels-Alder reaction between a series of dienes and electron deficient dienophiles using iminiumion catalysis, providing a novel molecular scaffold capable of performing this class of catalytic process.
STRONGLY LEWIS ACIDIC METAL-ORGANIC FRAMEWORKS FOR CONTINUOUS FLOW CATALYSIS
申请人:The University of Chicago
公开号:US20210053042A1
公开(公告)日:2021-02-25
Lewis acidic metal-organic framework (MOF) materials comprising triflate-coordinated metal nodes are described. The materials can be used as heterogenous catalysts in a wide range of organic group transformations, including Diels-Alder reactions, epoxide-ring opening reactions, Friedel-Crafts acylation reactions and alkene hydroalkoxylation reactions. The MOFs can also be prepared with metallated organic bridging ligands to provide heterogenous catalysts for tandem reactions and/or prepared as composites with support particles for use in columns of continuous flow reactor systems. Methods of preparing and using the MOF materials and their composites are also described.
Strongly Lewis Acidic Metal–Organic Frameworks for Continuous Flow Catalysis
作者:Pengfei Ji、Xuanyu Feng、Pau Oliveres、Zhe Li、Akiko Murakami、Cheng Wang、Wenbin Lin
DOI:10.1021/jacs.9b07891
日期:2019.9.18
provided a quantitative measurement of Lewis acidity of ZrOTf-BTC with an energy splitting (ΔE) of 0.99 eV between the πx* and πy* orbitals, which is competitive to the homogeneous benchmark Sc(OTf)3. ZrOTf-BTC was shown to be a highly active solid Lewisacidcatalyst for a broad range of important organic transformations under mild conditions, including Diels-Alder reaction, epoxide ring-opening reaction