Reductive debenzylation of hexabenzylhexaazaisowurtzitane — the key step of the synthesis of polycyclic nitramine hexanitrohexaazaisowurtzitane

Study of Deactivation of Pd(OH)2/C Catalyst in Reductive Debenzylation of Hexabenzylhexaazaisowurtzitane

“…According to mentioned studies [12][13][14], liquid-solid boundary on catalyst particles becomes acidic during debenzylation reaction. By reducing the pH of environment around the actives ites in catalyst, the palladium particles in the catalyst can be leached into liquid phase.I tw as demonstrated in some studies [6,8]t hat the debenzylation reaction has beena ffected by the palladium contenti nc atalyst. Hence, it can be concluded that the leaching of palladium particles hasasignificant effect on the catalyst deactivation.…”

“…The preparation of supported catalyst involves contacting support materials such as metal oxides or carbon materials with as uitable precursor of the active component,w hich is converted into the active component. So far,s everal groupsh ave investigated the debenzylation of HBIW over supported palladium on activated carbon [6][7][8][9][10][11].…”

“…Koskin et al [8] reported that the first step of debenzylation plays an activer ole in the deactivation of supported palladium catalyst. They stated that byproducts such as benzyl acetamide cause the deactivation of palladium catalyst.…”

“…The preparation of supported catalyst involves contacting support materials such as metal oxides or carbon materials with as uitable precursor of the active component,w hich is converted into the active component. So far,s everal groupsh ave investigated the debenzylation of HBIW over supported palladium on activated carbon [6][7][8][9][10][11].Supported palladium catalysti sr elatively expensive and quickly deactivated during the debenzylation of HBIW.T his issue raises the overall cost of HNIW.I ts eems that the most significant obstacle in the development of HNIW is its high cost compared to conventional nitramine explosives such as HMX and RDX.Koskin et al [8] reported that the first step of debenzylation plays an activer ole in the deactivation of supported palladium catalyst. They stated that byproducts such as benzyl acetamide cause the deactivation of palladium catalyst.…”

Development of new methods in modern selective organic synthesis: preparation of functionalized molecules with atomic precision

“…TADF) have been reported. 619,620 The studies concerned the effects of the preparation procedure of heterogeneous catalysts, components of the reaction mixture and process conditions on the catalyst stability against deactivation in the catalytic debenzylation. Using modern methods of analysis, the authors established the optimal degree of dispersion of Pd on the support surface for debenzylation.…”