Quality Control of 3,5-Dimethyl-1H-pyrazole. I found the field of Chemistry; Crystallography; Materials Science very interesting. Saw the article Nonmetallic Pentazole Salts Based on Furazan or 4-Nitropyrazole for Enhancing Density and Stability published in 2021.0, Reprint Addresses Hu, BC; Cheng, GB (corresponding author), Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China.. The CAS is 67-51-6. Through research, I have a further understanding and discovery of 3,5-Dimethyl-1H-pyrazole.
In this work, three novel nonmetallic pentazole salts (6-8) based on furazan or 4-nitropyrazole were synthesized. Some coplanar groups were introduced into the compounds to improve the planarity of the crystal packing. 4-Amino-1,2,5-oxadiazole-3-carbohydrazonamide pentazolate (6), 5-(4-amino-1,2,5-oxadiazol-3-yl)-4H-1,2,4-triazole-3,4-diamine pentazolate (7), and 5,5′-(4-nitro-1H-pyrazole-3,5- diyl)-bis(4H-1,2,4-triazole-3,4-diamine) pentazolate (8) all show more stable pi-pi stacking and exhibit superior thermal stability (110.5-116.4 degrees C) than most other reported nonmetallic pentazole salts (T-onset: 80-110 degrees C), and compound 8 has the highest crystal density (1.722 g.cm(-3)/173 K) of nonmetallic pentazole salts to date. All salts have been thoroughly characterized by NMR (H-1 and C-13) spectroscopy, infrared (IR), Roman (RA), and elemental analysis. The decomposition temperature of all salts displays more than 110 degrees C, which is measured by differential scanning calorimetry (DSC). These compounds all shows low sensitivity (IS > 35 J, FS > 360 N) measured by standard BAM methods. Glycidyl azide polymer (GAP) based propellant formula with the addition of salt 6 or 7 shows a higher specific impulse (6, I-sp = 262.1 s; 7, I-sp = 263.9 s) than that of RDX (I-sp = 259.0 s). This study can provide a new crystal engineering way for the synthesis of pentazole salt to solve the problem of low density and poor stability.
Quality Control of 3,5-Dimethyl-1H-pyrazole. Welcome to talk about 67-51-6, If you have any questions, you can contact Hu, W; Yang, HW; Chen, JY; Zhang, C; Sun, CG; Hu, BC; Cheng, GB or send Email.
Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics