TG study of the Li[0.4]Fe[2.4]Zn[0.2]O[4] ferrite synthesis

In this paper, the kinetic analysis of Li-Zn ferrite synthesis was studied using thermogravimetry (TG) method through the simultaneous application of non-linear regression to several measurements run at different heating rates (multivariate non-linear regression). Using TG-curves obtained for the four heating rates and Netzsch Thermokinetics software package, the kinetic models with minimal adjustable parameters were selected to quantitatively describe the reaction of Li-Zn ferrite synthesis. It was shown that the experimental TG-curves clearly suggest a two-step process for the ferrite synthesis and therefore a model-fitting kinetic analysis based on multivariate non-linear regressions was conducted. The complex reaction was described by a two-step reaction scheme consisting of sequential reaction steps. It is established that the best results were obtained using the Yander three-dimensional diffusion model at the first stage and Ginstling-Bronstein model at the second step. The kinetic parameters for lithium-zinc ferrite synthesis reaction were found and discussed

Synthesis of Sulphanylamides from New Derivatives of Aminopyrazoles

Для недавно синтезированных 3-арил-5-метоксиметил-4-амино-1Н-пиразолов проведена реакция сульфонилирования по аминогруппе п-ацетамидобензолсульфохлоридом. В результате впервые получены сульфаниламидные производные замещенных аминопиразолов, идентифицированные с использованием ИК-, ЯМР1Н-спектроскопии и масс-спектрометрииFor the newly synthesized 3-aryl-5-methoxymethyl-4-amino-1H-pyrazoles the sulfonylation reaction of the amino group by p-acetamidobenzenesulfonyl chloride was carried out. As a result, sulfanilamide derivatives of substituted aminopyrazoles identified using NMR1H, IR spectroscopy and mass spectrometry were obtained for the first tim

New Sulfamides Based on 1-Izopropil-3-α-Naftyl-5- Methoxymethyl-4-Aminopyrazole and Determination of Their Structure

Для ранее полученного 1-изопропил-3-α-нафтил-5-метоксиметил-4-нитрозопиразола проведена реакция восстановления гидразингидратом. Впервые был синтезирован 1-изопропил-3-α-нафтил-5-метоксиметил-4-аминопиразол, который затем сульфонилировали п-ацетамидобензолсульфохлоридом и п-толуолсульфохлоридом. В результате получены ранее неизвестные сульфонилированные производные N-алкилированных аминопиразолов. Состав и строение подтверждены современными методами анализа, такими как ИК-, ЯМР 1Н-спектроскопия и масс-спектрометрияFor the previously obtained 1-isopropyl-3-α-naphthyl-5-methoxymethyl-4-nitrosopyrazole, a reduction reaction with hydrazine hydrate was performed. It was first synthesized by 1-isopropyl-3-α-naphthyl- 5-methoxymethyl-4-aminopyrazole which was then sulfonylated by p-acetamidobenzenesulfonyl chloride and p-toluenesulfonic chloride. As a result previously unknown sulfonylated derivatives of N-alkylated aminopyrazoles were obtained. The composition and structure are confirmed by modern methods of analysis such as IR, 1H NMR spectroscopy and mass spectrometr