Amidation of Carboxylic Acids with Amines by Nb<sub>2</sub>O<sub>5</sub>as a Reusable Lewis Acid Catalyst
作者:Md. A. Ali、S. M. A. H. Siddiki、Wataru Onodera、Kenichi Kon、Ken-ichi Shimizu
DOI:10.1002/cctc.201500672
日期:2015.11
Among 28 types of heterogeneous and homogenous catalysts tested, Nb2O5 shows the highest yield for directamidation of n‐dodecanoic acid with a less reactive amine (aniline). The catalytic amidation by Nb2O5 is applicable to a wide range of carboxylic acids and amines with various functional groups, and the catalyst is reusable. A comparison of the results of the catalytic study and an infrared study
在测试的28种非均相和均相催化剂中,Nb 2 O 5对正十二烷酸与反应性较小的胺(苯胺)的直接酰胺化反应显示出最高的收率。由Nb 2 O 5催化的酰胺化适用于具有各种官能团的多种羧酸和胺,并且该催化剂是可重复使用的。催化研究和红外研究吸附在催化剂上的乙酸的结果比较表明,Nb 2 O 5上的路易斯酸位点活化了羧酸的羰基,这是Nb的高活性的原因。2 ø 5催化剂。动力学研究表明,Nb 2 O 5上的路易斯酸位比常规路易斯酸性氧化物(Al 2 O 3,TiO 2)具有更高的耐水性。与最新的酰胺化均相路易斯酸催化剂(ZrCl 4)相比,溶液中碱性添加剂对Nb 2 O 5的负面影响较小,这表明Nb 2 O 5对碱的耐受性更高。路易斯酸催化剂比均相路易斯酸催化剂。
Über das Vorkommen von Embelin in der Familie der Myrsinaceen
作者:R. Merian、E. Schlittler
DOI:10.1002/hlca.19480310747
日期:——
Aus Rapanea neurophylla, Embelia kilimandscharica und Myrsine africana wurde 2,5-Dioxy-3-undecyl-l,4-benzochinon, Embelin, extrahiert.
Robertson, Journal of the Chemical Society, 1908, vol. 93, p. 1037
作者:Robertson
DOI:——
日期:——
Preparation of esters and amides from carboxylic acids and N-formylation of amines promoted by 1,3,5-triazo-2,4,6-triphosphorine-2,2,4,4,6,6-hexachloride (TAPC)
作者:Kiumars Bahrami、Mohammad M. Khodaei、Homa Targhan、Mehdi Sheikh Arabi
DOI:10.1016/j.tetlet.2013.07.033
日期:2013.9
A new method is described for the preparation of esters and amides promoted by TAPC from carboxylic acids using a solvent-free grinding technique. The solvent-free N-formylation of amines is also reported. (C) 2013 Elsevier Ltd. All rights reserved.
<i>N</i>-Amidation by Copper-Mediated Cross-Coupling of Organostannanes or Boronic Acids with <i>O</i>-Acetyl Hydroxamic Acids
作者:Zhihui Zhang、Ying Yu、Lanny S. Liebeskind
DOI:10.1021/ol8009682
日期:2008.7.17
A general nonoxidative N-amidation of organostannanes and boronic acids has been developed. Under nonbasic conditions a wide variety of aryl, alkenyl, and heteroaryl organostannanes and boronic acids couple efficiently with O-acetyl hydroxamic acids in the presence of Cu(I) sources.