No abstract

E)-1,2-Bis(3,5-dinitro-1H-pyrazol-4-yl)diazene (H 2 NPA, 1) and its energetic salts, which are a series of new, energetic, highly heat-resistant, dense explosives, were synthesized. The explosives contain four nitro groups and an azo-bridged framework and were characterized by 1 H and 13 C NMR (in some cases 15 N NMR) spectroscopy, IR spectroscopy, and elemental analysis. The crystal structures of K 2 NPA (a three-dimensional metalorganic framework, 3D MOF) and the guanidinium salt 4 were determined by single-crystal X-ray diffraction, and their properties (density, thermal stability, and sensitivity towards impact and friction) were investigated. The detonation properties were evaluated from the measured density and calculated heat of formation by the EXPLO5 v6.01 program. All of the salts exhibit thermal stabilities with decomposition temperatures ranging from 156 to 315°C, high densities (1.70-2.15 g cm -3 ), high deto- [a]

To reach the long-term, strongly desired goal of high energy density materials (HEDM), a novel N-bridged structure of N-(3,5-dinitro-1H-pyrazol-4-yl)-1H-tetrazol-5-amine, and its selected nitrogen-rich energetic salts are designed and synthesized.

A series of enantioselective pyrrolidine‐2,4,4‐tricarboxylate derivatives were synthesized by the [3+2] 1,3‐dipolar cycloaddition of azomethine ylide with alkylidene malonates. By using 4 mol % of a CuIIN,P oxazolinylferrocene ligand complex and 10 mol % of a base, pyrrolidine analogues were obtained in high yields (77–99 %) and excellent enantioselectivities (up to 99 % ee).

A direct and convenient method has been developed for the synthesis of optically active pyrrolidines bearing a quaternary stereogenic center containing a CF3 group at the C-3 position of the pyrrolidine ring. The synthesis system, Cu(I) /Si-FOXAP-catalyzed exo-selective 1,3-dipolar cycloaddition of azomethine ylides with β-CF3 -β,β-disubstituted nitroalkenes, provides pyrrolidines with high diastereoselectivities (up to >98:2 d.r.) and excellent enantioselectivities (up to >99.9 ee) and performs well for a broad scope of substrates under mild conditions.