Stereochemical studies on the intramolecular diels alder reaction of furans with doubly activated dienophiles.
作者:Laurence M. Harwood、Geraint Jones、John Pickard、Royston M. Thomas、David Watkin
DOI:10.1016/s0040-4039(00)82203-0
日期:1988.1
The stereochemical outcome of intramolecular Diels-Alder reactions of furans with Z- and E-2-ene-1,4-dione units attached by a bridging chain to C-2 of the furan results from modification of the steric demands of the bridging chain by the preference of the external activating group to adopt an endo- stereochemistry.
5-Hydroxymethylfurfural (HMF) hydrodeoxygenation to 2,5-dimethylfuran (DMF) plays a significant role in biomass conversion. Herein, we develop a facile CoMo bimetallic catalyst with CoN4 single atom sites and low Co content (0.14 wt%) for this transformation which exhibits superior performance than most previous works (Turnover frequency up to 28.7 h−1, more than 8 cycles). A synergistic catalytic
5-羟甲基糠醛 (HMF) 加氢脱氧生成 2,5-二甲基呋喃 (DMF) 在生物质转化中起着重要作用。在此,我们为这种转化开发了一种具有 CoN 4单原子位点和低 Co 含量 (0.14 wt%)的简便 CoMo 双金属催化剂,其表现出优于大多数先前工作的性能(转换频率高达 28.7 h -1,超过 8 个循环) . 揭示了Co和Mo位点之间的协同催化作用,其中Mo位点主要参与底物的吸附,Co位点主要实现H 2 的吸附和活化. 机理研究表明,5-甲基-2-糠醛(MF)是产生1,2-双(5-甲基呋喃-2-基)乙烷(BMF)的主要原因,醛基的氢解是该反应的缓慢步骤。根据这些机制的见解,首先采用两步一锅法进行 HMF 加氢脱氧,从而在更温和的条件下获得更高的 DMF 产率。
Catalytic production of 2,5-dimethylfuran from 5-hydroxymethylfurfural over Ni/Co3O4 catalyst
作者:Panpan Yang、Qiqi Cui、Yanhong Zu、Xiaohui Liu、Guanzhong Lu、Yanqin Wang
DOI:10.1016/j.catcom.2015.02.014
日期:2015.6
Ni/Co3O4, a non-precious metal catalyst was used for the first time in the catalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). Under relatively mild conditions (130 degrees C, 1.0 MPa), as high as 76% yield of DMF was achieved. The addition of Ni not only prevented the formation of by-products, which happened due to the over-reduction of Co3O4 during hydrogenolysis, but also enhanced the reusability of Ni/Co3O4, and the catalyst could be reused for 6 times without loss of activity. Crown Copyright (C) 2015 Published by Elsevier B.V. All rights reserved.
HARWOOD, LAURENCE M.;JONES, GERAINT;PICKARD, JOHN;THOMAS, ROYSTON M.;WATK+, TETRAHEDRON LETT., 29,(1988) N 45, C. 5825-5828