在易于制备的负载型氢氧化钌催化剂存在下,Ru(OH)x / Al 2 O 3,各种结构多样的伯叠氮化物(包括苄基,烯丙基和脂肪族的)可以以中等至高收率转化成相应的腈(13个实例,收率65-94%)。与小规模(0.5 mmol)转化相比,苄基叠氮化物的克级(1 g)转化有效地进行,得到苄腈(0.7 g,90%收率),性能没有任何下降。催化确实是非均相的,回收的催化剂可以重复用于苄基叠氮化物的转化,而不会明显丧失其高性能。当前的叠氮化物向腈的转化可能通过酰亚胺形成的顺序反应进行,然后进行脱氢(β-消除)以产生相应的腈。Ru(OH)x /铝通过将伯叠氮化物(苄基和脂肪族的)转化为腈,然后依次水合形成的腈,可以进一步使用2 O 3催化剂在水中合成酰胺。此外,可以使用Ru(OH)x / Al 2 O 3从烷基卤化物和TBAN 3(TBA =四正丁基铵)直接进行一锅合成,从而以中等至高收率得到相应的腈(10个例子,
Studies on Synthesis of Novel Triazole Tagged Pyrazole Fused Naphthalene 5-Thiazine-5,5-dioxide Derivatives, Their Antimicrobial, and Antioxidant Activity
作者:G. Malla Reddy、P. Nagender、R. Naresh Kumar、J. H. Ahn、K. Pranay Kumar、A. K. R. Kanugula、K. V. S. Rama Krishna、S. Kotamraju、B. Narsaiah
DOI:10.1002/jhet.2013
日期:2014.8
A series of noveltriazoletaggedpyrazolefused naphthalene-5-thiazine-5,5-dioxide derivatives and were synthesized starting from sodium salt of saccharin . The structure of each intermediate and products was established on the basis of spectroscopy data. All the synthesized compounds and were screened against various bacterial and fungal strains but found to show no activity up to 150-µg/mL concentration
Electrocatalytic Dechlorination of Dichloromethane in Water Using a Heterogenized Molecular Copper Complex
作者:Caroline K. Williams、Gavin A. McCarver、Amir Lashgari、Konstantinos D. Vogiatzis、Jianbing “Jimmy” Jiang
DOI:10.1021/acs.inorgchem.0c03833
日期:2021.4.5
a copper-free triazole unit (T1), was also investigated under the same condition and showed inferior catalytic activity, indicating the importance of the copper center. Plausible catalytic mechanisms are proposed for the formation of C1 and C2 products viaradical intermediates. Computational studies provided additional insight into the reaction mechanism and the selectivity toward the CH4 formation
从水中修复有机卤化物在环境保护和水处理中是一个具有挑战性的过程。在本文中,我们报告了一种分子铜(I)配合物,该分子具有两个三唑单元CuT2,处于非均相的水性体系中,该体系能够对二氯甲烷(CH 2 Cl 2)进行脱氯,从而提供碳氢化合物(甲烷,乙烷和乙烯)。在水中评估了催化性能,并在一定范围的电势(相对于Ag / AgCl相对于-1.1至-1.6 V)中表现出高的法拉第效率(平均70%CH 4)和高活性(在-1.6时具有最大-25.1 mA / cm 2) V vs Ag / AgCl),周转数为2.0×10 7。该CUT2催化剂在持续暴露于CH 2 Cl 2 14小时和CH 2 Cl 2暴露循环10 h中也表现出出色的稳定性。在相同条件下还研究了对照化合物,即无铜三唑单元(T1),并且显示出较低的催化活性,表明了铜中心的重要性。提出了通过自由基中间体形成C 1和C 2产物的可能的催化机理。计算研究为反应机理和对CH
Cyclodextrin-Grafted Silica-Supported Pd Nanoparticles: An Efficient and Versatile Catalyst for Ligand-Free C−C Coupling and Hydrogenation
irradiation has been shown to have a beneficial effect on catalyst preparation. The catalyst exhibited excellent activity in ligand‐free C−C Suzuki and Heck couplings with a large number of aryl iodide and bromides, in which microwave irradiation use cuts down reaction time. Pd/Si‐CD have shown high activity and selectivity in the hydrogenationreaction, and the semihydrogenation of phenyl acetylene was also
Organicazides were prepared fromprimaryamines in high yields by a metal free diazo-transfer reaction using 2-azido-1,3-dimethylimidazoliniumhexafluorophosphate (ADMP), which is safe and stable crystalline. The choice of base was important in the diazo-transfer reaction. In general, 4-(N,N-dimethyl)aminopyridine (DMAP) was efficient, but a stronger base such as alkylamine or DBU was more appropriate
Synthesis, surface properties, and biocompatibility of 1,2,3-triazole-containing alkyl β-d-xylopyranoside surfactants
作者:E. Davis Oldham、Srivenu Seelam、Carolina Lema、Renato J. Aguilera、Jennifer Fiegel、Stephen E. Rankin、Barbara L. Knutson、Hans-Joachim Lehmler
DOI:10.1016/j.carres.2013.06.020
日期:2013.9
β-xylopyranosides with 8, 10, or 12 carbons caused toxicity via apoptosis, with CC50 values ranging from 26-890 μM. The two longest chain compounds did form stable monolayers at the air-waterinterface over a range of temperatures, although a brief transition to an the unstable monolayer was observed.