Oxone® (2KHSO5·KHSO4·K2SO4) was used to promote the nitration of alkenes and alkynes with sodium nitrite (NaNO2) and potassium iodide (KI). This stable, easy-to-handle, and environmentally benign oxidant was used under mild conditions (room temperature) and provided short reaction times. Styrene derivatives that did not contain electron-donating groups afforded the corresponding nitro alkenes in moderate
The conversion of aryl alkenes into β‐nitrostyrenes or benzonitriles with NaNO2 can be governed by an appropriate choice of ionic liquid medium. A general trend was found for the selectivity of these processes, which depends on the nature of IL, with imidazolium‐based ILs, such as [Bmim] Cl, that favor the formation of β‐nitrostyrenes, while tetraalkylammonium‐based ILs, such as TBAA, that favor the
A novel OXONE® mediated direct difunctionalization of alkenes with NaNO2 in aqueous acetonitrile for the synthesis of α-nitrooximes was developed. The α-nitrooximes were readily prepared in moderate to high yields at room temperature under mild reaction conditions. The present protocol offers an easy and environmentally benign approach to access various α-nitrooximes derived from styrene derivatives.
Reactions of nitroacetic acid with aldehydes and enamines
作者:W. L. F. Armarego
DOI:10.1039/j39690000986
日期:——
Nitroaceticacid was fused with eighteen aromatic aldehydes and gave the respective β-nitrostyrenes. It was more reactive towards aldehydes with electron-withdrawing than with electron-releasing substituents. Nitromethane adducts or nitro-olefins were formed from the reaction of enamines with nitroaceticacid. Di-(3,4-dihydro-4-nitromethylquinazolinium) carbonate was obtained in good yield from quinazoline
Metal-free, room temperature, acid-K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> mediated method for the nitration of olefins: an easy approach for the synthesis of nitroolefins
作者:Srinivas Ambala、Rohit Singh、Maninder Singh、Pankaj Singh Cham、Ria Gupta、Gurunadham Munagala、Kushalava Reddy Yempalla、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1039/c9ra06414a
日期:——
Here, we have developed a simple, roomtemperaturemethod for the nitration of olefins by using inexpensive sodium nitrite as a source of nitro groups in the presence of trifluoroacetic acid (TFA) and potassium persulfate (K2S2O8) under an open atmosphere. Styrenes and mono-substituted olefins give stereo-selective corresponding E-nitroolefins under optimized conditions, however, 1,1-bisubstituted
在这里,我们开发了一种在三氟乙酸 (TFA) 和过硫酸钾 (K 2 S 2 O 8 ) 存在下,在开放条件下使用廉价的亚硝酸钠作为硝基源的简单室温烯烃硝化方法。气氛。苯乙烯和单取代烯烃在优化条件下产生立体选择性相应的E-硝基烯烃,然而,1,1-双取代烯烃产生E-和Z-硝基烯烃的混合物。优化的条件适用于给电子、吸电子、未取代和杂环苯乙烯和单取代烯烃,并得到相应的硝基烯烃,收率良好。