Selective production of bio-based <i>para</i>-xylene over an FeO<sub>x</sub>-modified Pd/Al<sub>2</sub>O<sub>3</sub> catalyst
作者:Yuxue Xiao、Qingwei Meng、Xiaoli Pan、Chao Zhang、Zaihui Fu、Changzhi Li
DOI:10.1039/d0gc00944j
日期:——
substrate from η2-(C,O), the key transition state of the decarbonylationreaction, to the η1-(O) mode that favors the hydrodeoxygenation process. Notably, this designed catalyst is highly stable and is readily applicable in the selective synthesis of a broad range of desired aromatic chemicals via the same DHA–HDO pathway from cyclohex-3-enecarbaldehyde derivatives. Overall, this work develops a controllable
对二甲苯(PX)是聚对苯二甲酸乙二醇酯的基本结构单元,目前是从石油资源生产的。为解决经济和环境问题,非常需要开发一种可再生的PX路线。多次尝试使用贵金属催化剂(例如Pd / Al 2 O 3)由生物质衍生的4-甲基-3-环己烯-1-甲醛(4-MCHCA)合成PX,但遭受严重的脱羰反应,从而产生甲苯作为主要产品。在本文中,我们报告了一种FeO x改性策略,以抑制Pd / Al 2 O 3催化剂上的脱羰反应,从而导致向PX的选择性急剧变化,收率高达81%通过级联的脱氢芳香化-加氢脱氧(DHA-HDO)途径。表征与对照实验表明,钯位点的电子密度在FeO的降低X改性的Pd / Al的2 ö 3催化剂相比的Pd / Al的2 ö 3,从而从η调谐基板的优先吸附模式2 - (C ,O)中,脱羰反应的关键过渡状态,给η 1 - (O)有利于加氢脱氧过程模式。值得注意的是,本设计的催化剂是高度稳定的,并且
Mousseron; Winternitz; Jacquier, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1947, vol. 224, p. 1062
作者:Mousseron、Winternitz、Jacquier
DOI:——
日期:——
A convenient and efficient method for incorporation of pentafluorosulfanyl (SF5) substituents into aliphatic compounds
作者:William R. Dolbier、Samia Aït-Mohand、Tyler D. Schertz、Tatiana A. Sergeeva、Joseph A. Cradlebaugh、Akira Mitani、Gary L. Gard、Rolf W. Winter、Joseph S. Thrasher
DOI:10.1016/j.jfluchem.2006.05.003
日期:2006.10
Both SF5Cl and SF5Br undergo smooth, high yield addition to alkenes and alkynes under the mild free radical chain reaction conditions of triethylborane initiation at low temperature, although the SF5Br chemistry is somewhat limited by its competing high electrophilic reactivity with electron rich alkenes. The SF5Cl addition reaction is relatively insensitive to a wide variety of non-allylic functionalities. (c) 2006 Elsevier B.V. All rights reserved.