Energetic silicones: synthesis and characterization of pentaoxadiazole-PDMS copolymers
Standing at the forefront of energetics research is the exploration of energetic binders.
Shear, Trevor A.↗
Engineering topics
Zhang, Mao-Xi
Publications and source records attributed to Zhang, Mao-Xi.
Single-Step Mechanism for Regioselective Nitration of 9,10-BN-Naphthalene with Acetyl Nitrate in the Gas Phase
Here, the energetics of the regioselective mononitration of 9,10-BN-naphthalene with acetyl nitrate (H 3 C 2 NO 4 ) were modeled with ab initio simulations in the gas phase and an acetonitrile solvent. The single-electron-transfer (SET) nitration mechanism leading to a σ-complex and a single-step nitration mechanism were modeled. The energy barrier for the single-step mechanism was lower than that for the SET mechanism in the gas phase. However, the two are much more energetically competitive in the solvent. The σ-complex was found to be unstable in the gas phase owing to the interaction with the counterion. Using the single-step mechanism, the carbon site 1 nearest boron had the lowest activation energy for nitration of 22.6 kcal/mol, while site 3 had the second lowest barrier of 24.6 kcal/mol. Finally, details on the molecular structures at intermediate and transition states as well as charges in different configurations are discussed.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Mono- and Dinitro-BN-Naphthalenes: Formation and Characterization
Mono- and dinitro-BN-naphthalenes, i.e., 1-nitro-, 3-nitro-, 1,6-dinitro-, 3,6-dinitro-, and 1,8-dinitro-BNN, were generated in the nitration of 9,10-BN-naphthalene (BNN), a boron–nitrogen (BN) bond-embedded naphthalene, with AcONO 2 and NO 2 BF 4 in acetonitrile. The nitrated products were isolated and characterized by NMR, GC-MS, IR, and X-ray single crystallography. The effects of the nitration on the electron density and aromaticity of BNN were evaluated by B-11 NMR analysis and HOMA calculations.
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗