Synthesis of 1,3,4-oxadiazolium and 1,3,4-oxadiazolo[3,2-a]pyridinium salts
作者:G. V. Boyd、S. R. Dando
DOI:10.1039/j39700001397
日期:——
is described. Numerous 3-aryl-1,3,4-oxadiazolium salts, containing a novel type of heterocyclic cation, have been prepared by the action of carboxylic anhydrides on diacylarylhydrazines in the presence of perchloric or fluoroboric acid. 1,3,4-Oxadiazolo[3,2-a]pyridinium salts are similarly formed from 1 -acylamino-2-pyridones. The stability of the salts and their i.r. and n.m.r. spectra are discussed
已经研究了一些简单的1,3,4-恶二唑的质子化和烷基化,并描述了一种新的1,3,4-恶二唑的合成。在高氯酸或氟硼酸的存在下,通过羧酸酐对二酰基芳基肼的作用,已经制备了许多含有新型杂环阳离子的3-芳基-1,3,4-恶二唑鎓盐。类似地由1-酰基氨基-2-吡啶酮形成1,3,4-氧杂二唑[3,2- a ]吡啶鎓盐。讨论了盐的稳定性及其ir和nmr光谱。
Ligand-free Cu(<scp>ii</scp>)-mediated aerobic oxidations of aldehyde hydrazones leading to N,N′-diacylhydrazines and 1,3,4-oxadiazoles
作者:Lei Liu、Suliu Feng
DOI:10.1039/c7ob00042a
日期:——
A Cu(II)-mediated synthesis of N,N′-diacylhydrazines and 1,3,4-oxadiazoles from aldehyde hydrazones has been developed. This is the first time that the synthesis of N,N′-diacylhydrazines and 1,3,4-oxadiazoles using N,N-dimethylamides as the acylation reagent and O2 in air as the oxidation reagent is reported. These reactions offered several advantages including simple workups, ligand-free inexpensive
The methods of preparing 2,4-dihydro-1,3,4-thiadiazole-2-thiones are discussed. The structure of the reaction products of these compounds or their methiodides with amines is determined to be 1,3-dihydro-1,2,4-triazole-3-thiones.
Liquidα-nitrotoluenedecomposes on heating into benzonitrile, benzaldehyde, benzaldehyde oxime, oxides of nitrogen, and water. Prolonged heating (over 2 h) at 125 °C leads to N,N′-dibenzoyl-N-phenylhydrazine, α-nitrostilbene, 3,4,5-triphenylisoxazole, 1,3,5-triphenyl-1,2,4-triazole, 3,5-diphenyl-1,2,4-oxadiazole, benzamide, benzylideneaniline, benzanilide, and trans-stilbene. The product distribution
This invention is concerned with insecticidal compositions containing N'-substituted-N,N'-diacylhydrazines, methods of using such compositions and with certain of the insecticidal N'-substituted-N,N'-diacylhydrazines which are novel compounds.