N 掺杂的多孔碳 (NC) 是由甘蔗渣合成的,甘蔗渣是一种可持续且广泛使用的生物质废物。优选的 NC 样品具有发达的多孔结构、类似石墨烯的表面形态和不同的 N 种类。更重要的是,多相碳催化剂在各种杂环氮化合物的有氧脱氢反应中表现出优异的催化性能(49个例子,产率高达96%),类似于C 3 N 4和GO。TEM、BET 和 XPS 表征以及 EPR 分析表明,NC 的增强催化性能来自其对 O 2和杂环氮的高活化能力,分别归因于多孔结构和吡啶 N (N-6) 物种.
synthetically versatile tetrahydroquinoline molecules with I2 and HBpin is described. In the presence of iodine (20 mol%) as a catalyst, reduction of quinolines and other N-heteroarenes proceeded readily with hydroboranes as the reducing reagents. The broad functional-group tolerance, good yields and mild reaction conditions imply high practical utility.
An organocatalyst bound α-aminoalkyl radical intermediate for controlled aerobic oxidation of iminium ions
作者:Abdul Motaleb、Asish Bera、Pradip Maity
DOI:10.1039/c8ob01032c
日期:——
A catalyst bound α-aminoalkyl radicalintermediate from iminium is developed to control its formation and reactivity with aerobic oxygen. The influence of the catalyst was demonstrated via the ease of radicalintermediate formation and its subsequent reactivity, including the first catalyst-controlled enantioselective aerobic oxidation with a chiral phosphite catalyst.
Noncyclic polyethers exhibiting lithium ion selectivity have been synthesized. Their competitive alkalimetal-ion transport through liquid membranes has been investigated, and the influence of their structures on the rates and selectivities of cationtransport has been demonstrated. It has been found that the introduction of the oxytrimethylene chain on the polyethers is significant for the appearance
Boric acid catalyzed chemoselective reduction of quinolines
作者:Dipanjan Bhattacharyya、Sekhar Nandi、Priyanka Adhikari、Bikash Kumar Sarmah、Monuranjan Konwar、Animesh Das
DOI:10.1039/c9ob02673h
日期:——
Boricacid promoted transfer hydrogenation of substituted quinolines to synthetically versatile 1,2,3,4-tetrahydroquinolines (1,2,3,4-THQs) was described under mild reaction conditions using a Hantzsch ester as a mild organic hydrogen source. This methodology is practical and efficient, where isolated yields are excellent and reducible functional groups are well tolerated in the N-heteroarene moiety
A Screening Platform to Identify and Tailor Biocompatible Small‐Molecule Catalysts
作者:Rudy Rubini、Ilya Ivanov、Clemens Mayer
DOI:10.1002/chem.201904808
日期:2019.12.13
biocompatible catalysts, we describe a 96-well screeningplatform that couples the activity of synthetic catalysts to yield non-canonical amino acids from appropriate precursors with the subsequent incorporation of these nonstandard building blocks into GFP (quantifiable readout). Critically, this strategy does not only provide a common readout (fluorescence) for different reaction/catalyst combinations