一种新型的表面活性剂(槲皮素)辅助水热法用于制备相纯的氧化钴(Co 3 O 4)纳米粒子(Nps)。槲皮素在生产尺寸受控的Nps时起表面活性剂的作用。通过各种技术对生产的Nps进行了广泛表征,以揭示其化学成分,结构,形态,尺寸和热行为。该研究的主要目的是将所制备的材料用作非均相催化剂,用于治疗性重要醛的氢化。催化剂的能力似乎很好,因为在短时间内从结构上不同的醛得到的醇产率是足够的。同样,该催化剂是可回收的,稳定的,不需要添加配体进行活化和对环境无害。
Chemoselective Hydrogenation of Aldehydes under Mild, Base-Free Conditions: Manganese Outperforms Rhenium
作者:Mathias Glatz、Berthold Stöger、Daniel Himmelbauer、Luis F. Veiros、Karl Kirchner
DOI:10.1021/acscatal.8b00153
日期:2018.5.4
catalysts for the homogeneous chemoselective hydrogenation of aldehydes. Among these, [Mn(PNP-iPr)(CO)2(H)] was found to be one of the most efficient base metal catalysts for this process and represents a rare example which permits the selectivehydrogenation of aldehydes in the presence of ketones and other reducible functionalities, such as C=C doublebonds, esters, or nitriles. The reaction proceeds
Base-Catalyzed Cascade Reaction of <i>ortho</i>
-(Propargylamino)aryl Ketones with N-, O-, or S-Based Nucleophiles for the Synthesis of 3-Functionalized Quinoline Scaffolds
作者:Liu-Zhu Yu、Hao-Zhao Wei、Min Shi
DOI:10.1002/adsc.201800120
日期:2018.5.16
A metal‐free and base‐catalyzed cascade reaction of ortho‐(propargylamino)aryl ketones with primary alcohols, secondary amines, including various N‐heterocycles, and thiols through 1,4‐benzoxazepine intermediates was developed, providing a series of synthetically and medically valuable 3‐functionalized quinoline derivatives. The reaction process was easily manipulable and environmentally benign, producing
Direct Synthesis of Amides from Coupling of Alcohols and Amines Catalyzed by Ruthenium(II) Thiocarboxamide Complexes under Aerobic Conditions
作者:Elangovan Sindhuja、Rengan Ramesh、Sundarraman Balaji、Yu Liu
DOI:10.1021/om500556b
日期:2014.8.25
the ruthenium(II) thiocarboxamide complexes were generated as highly efficient catalysts for synthesis of secondary or tertiary amides by coupling of amines and alcohols with low catalyst loading, and the maximum yield was obtained up to 97%. The coupling reaction can be readily carried out under mild aerobic conditions, and release of water is the only byproduct. Further, the effect of substituents
Microwave-accelerated crossed Cannizzaro reaction using barium hydroxide under solvent-free conditions
作者:Rajender S. Varma、Kannan P. Naicker、Per.J. Liesen
DOI:10.1016/s0040-4039(98)01922-4
日期:1998.11
solventless and expeditious method for the preparation of alcohols is described from aldehydes using barium hydroxide, Ba(OH)2.8H2O, and paraformaldehyde. A comparison of this microwave-accelerated Cannizzaroreaction to the one under conventional heating mode is also reported.