N,N′-Bis(2-hydroxyiminoalkyl)-α,α′-dinitrones are of interest for the synthesis of 1,1′-dihydroxy-2,2′-biimidazoles. Thermal decomposition of two these dinitrones was studied in helium atmosphere. Thermal decomposition of the studied dinitrones at temperature interval 20–500 °C consists of several steps, the first step accompanying with significant exothermic effect (700–1000 J g⁻¹). The first step has been shown to be a two-stage process, and decomposition products have been determined using chromatography–mass spectrometry. Thermogravimetric curves were used for the kinetic studies. Kinetic parameters of decomposition are estimated within the approaches of non-isothermal kinetics (“model-free” kinetics and nonlinear regression methods), with the computer program Netzsch Thermokinetics 2.

中文翻译：

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几种N，N'-双（2-羟基亚氨基烷基）-α，α'-二硝基酮的热分解

N，N′-双（2-羟基亚氨基烷基）-α，α′-二硝基对于合成1，1′-二羟基-2，2′-联咪唑是有意义的。在氦气氛中研究了这两个二硝基酮的热分解。在20–500°C的温度范围内，对所研究的二硝基甲烷的热分解包括几个步骤，第一步伴随着明显的放热效应（700–1000 J g ^-1）。第一步已被证明是一个两阶段的过程，并且使用色谱-质谱法确定了分解产物。热重曲线用于动力学研究。使用计算机程序Netzsch Thermokinetics 2，可以通过非等温动力学（“无模型”动力学和非线性回归方法）估算分解的动力学参数。