ARYLSULPHONATES OF SPIROPYRAZOLINES AND O-TOSILATE-β-(BENZIMIDAZOL-1-YL)PROPIOAMIDOXYME AS THE PRODUCTS OF β-AMINOPROPIOAMIDOXIMES TOSYLATION

Pyrazolinium structures have practically valuable biological properties. Their methods of synthesis mainly consist in the reactions of cyclization of steroid compounds containing an enone fragment with a variety of hydrazines. We have previously obtained new spiropyrazolinium compounds by hydrolysis of 3-(β-heteroamino)ethyl-5-aryl-1,2,4-oxadiazoles and by arylsulfochlorination of β-aminopropioamidoximes. The aim of the work is to reveal the dependence of the structure of the final β-aminopropioamidoximes tosylation products from the structure of the starting amidoxime and strength of base. Methodology. The tosylation of β-aminopropioamidoximes was carried out in chloroform using diisopropylethylamine as a base. The synthesis was carried out at room temperature for 15–20 h. The progress of the reaction was monitored by TLC. After completion of the reaction, the precipitate was filtered off, followed by evaporation of the filtrate and additional precipitation of the product; the combined precipitates were recrystallized from isopropanol. Results and discussion. The products of tosylation of β-aminopropioamidoximes were obtained in 45‒65% yields and identified using physicochemical and spectral [IR, NMR (1H and 13C)] characteristics, tosylation of β-aminopropioamidoximes (β-amino group: piperidin-1-yl, morpholine -1-yl, thiomorpholin-1-yl, 4-phenyl-piperazin-1-yl) proceeds with the formation of spirocyclic compounds ‒ arylsulfonates of 2-amino-1,5-diazaspiro [4.5]-dec-1-ene-5-ammonium; tosylation of β-(benzimidazol-1-yl)propioamidoxime gives the product on the oxygen atom of the amidoxime group.

Theoretical calculations, molecular dynamics simulations and experimental investigation of the adsorption of cadmium(ii) on amidoxime-chelating cellulose

Cd(ii) binds more favorably with C–NH2 in the amidoxime group of ACCS than with CN–OH.

Bifunctional polymeric microspheres for efficient uranium sorption from aqueous solution: synergistic interaction of positive charge and amidoxime group

Polymeric microspheres with a positive charge and amidoxime group are synthesized for uranium capture, and the synergistic interaction leads to highly selective and fast adsorption.

Preparation and Characterization of the Amidoxime-Modified Polyacrylonitrile (PAN-Amidoxime) Nanofibre Composite

In this research, a kind of nonwoven composite used for the absorption of heavy mental ions has been made. The composite was made of two layers of ES thermal bonded nonwovens as the protective layers and the PAN-amidoxime nanofibers which are prepared through the modification of electrospun PAN nanofibers as the interlayer. The composition was achieved by the ultrasonic bonding method. After the composition the PAN nanofibers were modified by grafting the amidoxime group to PAN. The results of FT-IR spectra and FE-SEM indicated that nitrile groups in PAN were partly converted into amidoxime groups and there were no serious cracks on the surface of PAN-amidoxime nanofibers. The results show that the amidoxime groups have been proved to be grafted to the PAN nanofibers with the percent grafting of 81.6%.

Preparation of Fe (III) – Amidoximated PAN Nanofibers Complexes for Degradation of Azo Dye under Visible Light Irradiation

Polyacrylonitrile (PAN) nanofibers were fabricated via electrospinning technique, and the modified Fe-polyacrylonitrile nanofibers photocatalysts(Fe-AO-n-PAN) were prepared by a reaction between PAN nanofibers (AO-n-PAN) containing amidoxime group and ferric chloride. Then Fe-AO-n-PAN were used as heterogeneous catalysts in the oxidative degradation reaction of C.I. Reactive Red 195(RR195) in water. This paper investigated the influences on the degree of the conversion from nitrile group to amidoxime group (CP%); analyzed the impacts on the Fe (III) ions content (QFe-PAN) in Fe-AO-n-PAN; and studied the effects of QFe-PANon the decoloration rate of the dye. The results indicated that the CP% value were greatly enhanced not only with concentration of NH2OH•HCl increasing, but also gradually with the prolongation of reaction time. In addition, the QFe-PANof Fe-AO-n-PAN increases with the rise of CFeand the CP% value. Finally, Fe-AO-n-PAN have remarkable catalytic activity on the degradation of RR 195, and higher QFe-PANcould promote the catalytic performance of Fe-AO-n-PAN.