Does electrophilic activation of nitroalkanes in polyphosphoric acid involve formation of nitrile oxides?
作者:Alexander V. Aksenov、Nicolai A. Aksenov、Nikita K. Kirilov、Anton A. Skomorokhov、Dmitrii A. Aksenov、Igor A. Kurenkov、Elena A. Sorokina、Mezvah A. Nobi、Michael Rubin
DOI:10.1039/d1ra06503c
日期:——
The mechanistic rationale involving activation of nitroalkanes towards interaction with nucleophilic reagents in the presence of polyphosphoricacid (PPA) was re-evaluated. Could nitrile oxide moieties be formed during this process? This experiment demonstrates that at least in some cases this could happen, as generated nitrile oxides were successfully intercepted as adducts of [3 + 2] cycloadditions
There is provided a fluorescent dye which can improve the fluorescent intensity at the time of labeling to thereby detect a biomolecule with higher sensitivity. The fluorescent dye of the present invention includes a nitrogen cation-containing group or a nitrogen-containing group. Its high water solubility can improve the rate of labeling for a biomolecule to thereby detect a biomolecule with high sensitivity.
Acetophenones with a variety of substituents could be converted to diacylfuroxans in a solvent-free reaction by combining the reagents Fe(NO3)(3)center dot 9H(2)O and P2O5 under high-speed ball milling. This reaction was facile and eco-friendly, and exhibits advantages in terms of better toleration, safety, and easier operation. The nitrate acid and nitrogen dioxide generated in situ should play a major role in this mechanochemical reaction. (C) 2019 Elsevier Ltd. All rights reserved.