Bukenov, Bauyrzhan; Baimatova, Nassiba; Kenessov, Bulat published an article on January 31 ,2022. The article was titled 《Quantification of transformation products of rocket fuel unsymmetrical dimethylhydrazine in air using solid-phase microextraction》, and you may find the article in Journal of Separation Science.COA of Formula: C4H6N2 The information in the text is summarized as follows:
Quantification of unsym. dimethylhydrazine transformation products in ambient air is important for assessing the environmental impact of heavy rocket launches. There are little data of such analyses, which is mainly caused by the low number of analytes covered by the available anal. methods and their complexity. A simple and cost-efficient method for accurate simultaneous determination of seven unsym. dimethylhydrazine transformation products in air using solid-phase microextraction followed by gas chromatog.-mass spectrometry was developed. The method was optimized for air sampling and solid-phase microextraction from 20-mL vials, which allows full automation of anal. The extraction for 5 min by Carboxen/polydimethylsiloxane fiber from amber vials and desorption for 3 min provided the greatest analytes’ responses, lowest relative standard deviations, linear calibration (R2 ≥ 0.99), and limits of detection from 0.12 to 0.5μg/m3. Samples with concentrations 500μg/m3 can be stored at 21 ± 1° without substantial losses (1-11%) for up to 24 h, while air samples with concentrations 10 and 50μg/m3 stored for up to 24 h can be used for accurate quantification of only two and four out of seven analytes, resp. The developed method was successfully tested for the anal. of air above real soil samples contaminated with unsym. dimethylhydrazine rocket fuel. In the experimental materials used by the author, we found 1-Methylpyrazole(cas: 930-36-9COA of Formula: C4H6N2)
1-Methylpyrazole(cas: 930-36-9) belongs to pyrazoles. Pyrazoles and their related multiring analogs are common elements of a wide variety of bioactive compounds. These ring structures are rare in nature. A consequence of this is that they have previously been thought to be poor moieties to include in potential new drugs. COA of Formula: C4H6N2
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics