Optimization of the reaction was first performed from acetamide on the basis of the achievements in the benzene series. Next, the identified conditions (use of copper(I) iodide, N,N′-dimethylethylenediamine, tripotassium phosphate in dioxane at 90 °C for 14 h) were applied to different aliphatic/aromatic primary and cyclic/acyclic secondary amides in order to determine the scope of the reaction, thus easily
A kinetic study of the one electron oxidation of substituted ferrocenes (FcX: X = H, COPh, COMe, CO2Et, CONH2, CH2OH, Et, and Me2) by a series of N-oxyl radicals (succinimide-N-oxyl radical (SINO), maleimide-N-oxyl radical (MINO), 3-quinazolin-4-one-N-oxyl radical (QONO) and 3-benzotriazin-4-one-N-oxyl radical (BONO)), has been carried out in CH3CN. N-oxyl radicals were produced by hydrogen abstraction from the corresponding N-hydroxy derivatives by the cumyloxyl radical. With all systems, the rate constants exhibited a satisfactory fit to the Marcus equation allowing us to determine self-exchange reorganization energy values (λNO˙/NO−) which have been compared with those previously determined for the PINO/PINO− and BTNO/BTNO− couples. Even small modification of the structure of the N-oxyl radicals lead to significant variation of the λNO˙/NO− values. The λNO˙/NO− values increase in the order BONO < BTNO < QONO < PINO < SINO < MINO which do not parallel the order of the oxidation potentials. The higher λNO˙/NO− values found for the MINO and SINO radicals might be in accordance with a lower degree of spin delocalization in the radicals MINO and SINO and charge delocalization in the anions MINO− and SINO− due to the absence of an aromatic ring in their structure.
importance. An attractive strategy is the arylation of imines with organoboronreagents. Chiral Rh complexes have reached a high level of productivity for this reaction type. In this article we describe that an electron rich PdII catalyst also performs well in the arylation of aldimines, comparable to the best Rh catalysts. The ferrocenyl palladacycle‐acetate catalyst allows for a broad substrate scope and
Magnetite nanoparticles coated with ruthenium via SePh layer as a magnetically retrievable catalyst for the selective synthesis of primary amides in an aqueous medium
作者:Hemant Joshi、Kamal Nayan Sharma、Alpesh K. Sharma、Om Prakash、Arvind Kumar、Ajai Kumar Singh
DOI:10.1039/c4dt01189a
日期:——
The nanostructured magnetic oxide Fe3O4 has been coated with silica and then reacted with phenylselenyl chloride under a N2 atmosphere and RuCl3·xH2O successively in an aqueous medium to prepare Fe3O4@SiO2@SePh@Ru(OH)x nanoparticles (NPs) for the first time. These magnetically retrievable NPs have been authenticated using TEM, SEM-EDX and powder-XRD and found to be an efficient catalyst for one pot
将纳米结构的磁性氧化物Fe 3 O 4涂覆二氧化硅,然后在水介质中在N 2气氛下与苯硒基氯和RuCl 3 · x H 2 O依次反应,制备Fe 3 O 4 @SiO 2 @ SePh @ Ru (OH)x首次使用纳米颗粒(NPs)。这些磁性可回收的NP已使用TEM,SEM-EDX和粉末XRD进行了鉴定,被发现是一种有效的催化剂,可用于一锅转化(无需有机溶剂)将醛,腈和苄胺转化为水中的伯酰胺。对于醛和腈,伯酰胺的收率高达93%。这些NP可以循环使用7次以上,以将苄腈转化为相应的酰胺。以Fe 3 O 4 @SiO 2 @ SePh @ Ru(OH)x NPs为催化剂进行克级转化,收率约为86%。
New Synthesis of Ferrocene Monocarboxylic Acid and Systematic Studies on the Preparation of Related Key-Intermediates
作者:Alberto Federman Neto、Joseph Miller、Vânia Faria de Andrade、Susana Yumi Fujimoto、Márcia Maísa de Freitas Afonso、Fernando Costa Archanjo、Vítor André Darin、Márcio Luís Andrade e Silva、Áurea Donizete Lanchote Borges、Gino Del Ponte
An improved technique for the preparation of ferrocenecarboxaldehyde and two new methods for the synthesis of ferrocenemonocarboxylic acid from the aldehyde or from acetyl ferrocene are described. Using the aldehyde or the monocarboxylic acid as starting materials, some important ferrocene key intermediates were prepared: monochlorocarbonyl ferrocene, alkali metal and ammonium ferrocenoates, ferrocene