Novel oxidative nitrogen to carbon rearrangement found in the conversion of anilines to benzaldoximes by treating with HCHO/H2O2
作者:Naval Kapuriya、Kalpana Kapuriya、Narsinh M. Dodia、Yi-Wen Lin、Rajesh Kakadiya、Chao-Ting Wu、Ching-Huang Chen、Yogesh Naliapara、Tsann-Long Su
DOI:10.1016/j.tetlet.2008.03.033
日期:2008.4
Novelrearrangement was found by reacting anilines with HCHO/H2O2 resulting in the synthesis of various benzaldoximes. The mechanism of the rearrangement is proposed and suggested that the rearrangement might proceed via unstable N-phenyloxazirane intermediate followed by the transfer of aryl moiety from nitrogen to carbon atom leading to the formation of benzaldoxime.
通过使苯胺与HCHO / H 2 O 2反应,发现了新颖的重排反应,从而合成了各种苯甲醛肟。提出了重排的机理,并提出重排可能通过不稳定的N-苯基恶嗪烷中间体进行,然后芳基部分从氮转移到碳原子,从而导致苯甲醛肟的形成。
P<sub>2</sub>O<sub>5</sub>/SiO<sub>2</sub> as an Efficient Reagent for the Preparation of <b> <i>Z</i> </b>-Aldoximes Under Solvent-Free Conditions
作者:Hossein Eshghi、Zinat Gordi
DOI:10.1080/10426500590924148
日期:2005.7.1
Abstract A facile and efficient method for the preparation of Z-aldoximes is improved by means of P2O5/SiO2 reagent in solvent-free media. Advantages of this method are the use of inexpensive and selectivereagent, with high yields in simple operation, and short reaction time undersolvent-freeconditions.
An Eco-Friendly System for Oximation of Organic Carbonyl Compounds Under Microwave Irradiation
作者:Hana Batmani、Davood Setamdideh
DOI:10.13005/ojc/300241
日期:2014.7.1
The oximation of a variety of organic carbonyl compounds was efficiently carried out with NH2OH·HCl under microwave irradiation. The reactions were performed in water or water-ethanol as green solvents to give Z-aldoxime isomers from the corresponding aldehydes and E-ketoxime isomers from the corresponding ketones in a perfect selectively with excellent yields.
A hydrophilic inorganic framework based on a sandwich polyoxometalate: unusual chemoselectivity for aldehydes/ketones with in situ generated hydroxylamine
作者:Songzhu Xing、Qiuxia Han、Zhuolin Shi、Shugai Wang、PeiPei Yang、Qiang Wu、Mingxue Li
DOI:10.1039/c7dt02411h
日期:——
method. The combination of [WZn3(H2O)2(ZnW9O34)2]12− and Co(II) provides a synergistical catalytic way to promote oximation of aldehyde/ketone with in situgenerated hydroxylamine that initially produces an oxime, which further either dehydrates into a nitrile or undergoes a Beckmann rearrangement to form an amide.
通过水热法制备亲水性无机多孔催化剂。[WZn 3(H 2 O)2(ZnW 9 O 34)2 ] 12-和Co(II)的组合提供了一种协同催化方式,以促进醛/酮与原位生成肟的羟胺肟化,其进一步脱水成腈或经历贝克曼重排以形成酰胺。
Synthesis of Oximes with NH2OH.HCl/DOWEX(R)50WX4 System
out with DOWEX(R)50WX4/NH2OH·HCl system. The reactions were performed in ethanol to give Z‐aldoximation isomers of aldehydes and E‐oximaton of acetophenone derivatives in a perfect selectively. The oximation of compounds with two carbonyl groups was carried out selectively on one carbonyl moiety. Also, the oximation of aldehydes over ketones has been accomplished successfully by this system.