complex presented higher reactivity in the transferhydrogenation (TH) of ketones in 2-propanol. Experimentally, it was established that both the benzimidazole and amine N–H proton played a vital role in the enhancement of the catalytic activity. Utilizing this system a wide range of aldehydes and ketones were reduced efficiently. Notably, the TH of several imines, as well as chemoselective reduction of
prepared via simple impregnation followed by the pyrolysis process. The prepared Ru/PNC-700 catalyst demonstrated remarkable catalytic activity in terms of conversion and selectivity towards N-alkylation of anilines with benzyl alcohol and chemoselective hydrogenation of aromatic nitro compounds. In addition, local anesthetic pharmaceutical agents (e.g., butamben and benzocaine), including key drug intermediates
3%Pt/D-TiO2/Ti3C2 showed excellent activity and chemoselectivity to N-alkyl amines in the presence of base additive K3PO4 undervisible-lightirradiation; interestingly the chemoselectivity almost completely switched to N-benzylideneanilines in the presence of base additive KOH. In comparison, Pt nanoparticles on S and N co-doped TiO2 prepared from titanium carbide (3%Pt/D-TiO2@C) showed sharply decreased activity
可见光诱导的一锅、多步和化学选择性可调反应突出了经济、可持续和绿色的过程。在此,我们报道了分散在 S 和 N 共掺杂二氧化钛/碳化钛 (MXene) (3%Pt/D-TiO 2 /Ti 3 C 2 ) 异质结上的 Pt 纳米粒子作为芳香硝基化合物和醇之间串联反应的光催化剂生产N-烷基化产品。通过在Ti 3 C 2纳米片上原位生长TiO 2制备3%Pt/D-TiO 2 /Ti 3 C 2异质结,S和N共掺杂TiO 2用硫脲,然后是平均直径为 2.9 nm 的 Pt 纳米颗粒,很好地分散在 D-TiO 2 /Ti 3 C 2 上。3%Pt/D-TiO 2 /Ti 3 C 2在可见光照射下,在碱性添加剂K 3 PO 4存在下对N-烷基胺表现出优异的活性和化学选择性;有趣的是,在碱添加剂 KOH 存在下,化学选择性几乎完全转换为N-亚苄基苯胺。相比较而言,在S和的Pt纳米颗粒N共掺杂TiO 2从碳化钛(3%的Pt
A conjugated ketone as a catalyst in alcohol amination reactions under transition-metal and hetero-atom free conditions
作者:Xingchao Dai、Xinjiang Cui、Youquan Deng、Feng Shi
DOI:10.1039/c5ra07681a
日期:——
Here, we show the results of a molecular-defined conjugatedketone catalyzed alcohol amination reaction. Under the optimized reaction conditions, the yields to the desired products reached 98%. The reaction mechanism and kinetic study supposed that carbonyl–hydroxyl groups are the catalytically active sites, and the transfer-hydrogenation reactions progress via the recycling of carbonyl and hydroxyl
Direct one-pot reductive imination of nitroarenes using aldehydes and carbon monoxide by titania supported gold nanoparticles at room temperature
作者:Jun Huang、Lei Yu、Lin He、Yong-Mei Liu、Yong Cao、Kang-Nian Fan
DOI:10.1039/c1gc15307b
日期:——
The direct one-pot reductive imination of nitroarenes with various aldehydes by a titania supportedgoldcatalyst at room temperature using CO/H2O as a reducing agent is illustrated. This method is simple, economic, general and environmentally benign, thus resulting in practical advantages for the synthesis of imines and their derivatives.