102-28-3Relevant articles and documents
Citric acid catalysed Beckmann rearrangement, under solvent free conditions
Thopate, Shankar Ramchandra,Kote, Santosh Rajaram,Rohokale, Sandeep Vasantrao,Thorat, Nitin Madhukar
, p. 124 - 125 (2011)
Citric acid is reported to be a highly efficient and eco-friendly catalyst for the Beckmann rearrangement under solvent free conditions.
Radical arylation of triphenyl phosphite catalyzed by salicylic acid: Mechanistic investigations and synthetic applications
Estruch-Blasco, Manel,Felipe-Blanco, Diego,Bosque, Irene,Gonzalez-Gomez, Jose C.
, p. 14473 - 14485 (2020)
A straightforward and scalable methodology to synthesize diphenyl arylphosphonates at 20 °C within 1-2 h is reported using inexpensive SA as the catalytic promoter of the reaction. Mechanistic investigations suggest that the reaction proceeds via radical-radical coupling, consistent with the so-called persistent radical effect. The reaction tolerated a wide range of functional groups and heteroaromatic moieties. The synthetic usefulness and the unique reactivity of the obtained phosphonates were demonstrated in different one-step transformations.
Preparation method of aminoacetanilide
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Paragraph 0046-0064, (2021/01/29)
The invention belongs to the technical field of dye intermediate production, and particularly relates to a preparation method of aminoacetanilide, which comprises the following steps of 1) adding an acetate compound, phenylenediamine and a catalyst triethylene diamine into a reactor, and uniformly mixing to obtain a mixed solution, 2) under the protection of nitrogen, heating the mixed solution to65-90 DEG C, dropwise adding acetic acid, and reacting for 4-9 hours after dropwise adding is finished, and 3) after the reaction is finished, cooling to 15-25 DEG C, standing for 5-8 hours, filtering, fully washing a filter cake with n-butyl alcohol, and drying in vacuum at 80 DEG C for 6 hours to obtain aminoacetanilide. Aminoacetanilide is synthesized by using an acetate method, acetic anhydride which is high in price and easy to prepare drugs is not used, the production cost is reduced, and the method is suitable for industrial production; the method has the advantages of few reaction steps, no generation of waste acid, waste water and waste salt and no pollution to the environment; the yield (based on the weight of phenylenediamine) of the aminoacetanilide product prepared by the method is up to 97% or above, and the purity is up to 98% or above.
Applicability of aluminum amalgam to the reduction of arylnitro groups
Luzzio, Frederick A.,Monsen, Paige J.
supporting information, (2020/11/02)
An array of arylnitro compounds with various functionality were treated with freshly-prepared aluminum amalgam in THF/water solution and resulted in the corresponding arylamines. The Al(Hg)-mediated reductions are relatively rapid with consumption of the amalgam and disappearance of starting material occurring over 20–30 min. The workup of the reductions involves only removal of the insoluble by-products by filtration followed by concentration. Only in some cases is chromatography required to secure the pure product. The desired arylamines are furnished in quantities of 25–100 mg, which in some cases, could be taken on to the next reaction without further purification. Reductions of 4-nitrobenzyl derivatives of carbohydrates or nucleosides were selective in affording the corresponding 4-aminobenzyl products. To show applicability in click chemistry, selected aminobenzyl products are directly azidated to yield products that were then used in click reactions to afford the corresponding 1,2,3-triazoles.
